failing tests with libpng 1.6.33

Hello everybody,

with libpng 1.6.33 I see failing tests:

=====================================
   libpng 1.6.33: ./test-suite.log
=====================================

# TOTAL: 33
# PASS:  31
# SKIP:  0
# XFAIL: 0
# FAIL:  2
# XPASS: 0
# ERROR: 0

.. contents:: :depth: 2

FAIL: tests/pngimage-quick
==========================

./contrib/pngsuite/ibasn0g01.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0xff -> 0x77
./contrib/pngsuite/ibasn0g02.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x9d
./contrib/pngsuite/ibasn0g04.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x20
./contrib/pngsuite/ibasn3p01.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x0f -> 0x07
./contrib/pngsuite/ibasn3p02.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x9d
./contrib/pngsuite/ibasn3p04.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x20
./contrib/pngsuite/iftbbn0g01.png: error(continuable): write(PACKSWAP): byte(0,4) changed 0x7f -> 0x00
./contrib/pngsuite/iftbbn0g02.png: error(continuable): write(PACKSWAP): byte(0,4) changed 0x2a -> 0x22
./contrib/pngsuite/iftbbn0g04.png: error(continuable): write(PACKSWAP): byte(6,2) changed 0xff -> 0xcd
PASS: pngimage --list-combos ./contrib/pngsuite/basn0g01.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn0g02.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn0g04.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn0g08.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn0g16.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn2c08.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn2c16.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn3p01.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn3p02.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn3p04.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn4a08.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn4a16.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn6a08.png
PASS: pngimage --list-combos ./contrib/pngsuite/basn6a16.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbbn0g01.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbbn0g02.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbbn0g04.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbbn2c16.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbbn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbgn2c16.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbgn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbrn2c08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbwn0g16.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbwn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftbyn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftp0n0g08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftp0n2c08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftp0n3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ftp1n3p08.png
FAIL: pngimage --list-combos ./contrib/pngsuite/ibasn0g01.png
FAIL: pngimage --list-combos ./contrib/pngsuite/ibasn0g02.png
FAIL: pngimage --list-combos ./contrib/pngsuite/ibasn0g04.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn0g08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn0g16.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn2c08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn2c16.png
FAIL: pngimage --list-combos ./contrib/pngsuite/ibasn3p01.png
FAIL: pngimage --list-combos ./contrib/pngsuite/ibasn3p02.png
FAIL: pngimage --list-combos ./contrib/pngsuite/ibasn3p04.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn4a08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn4a16.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn6a08.png
PASS: pngimage --list-combos ./contrib/pngsuite/ibasn6a16.png
FAIL: pngimage --list-combos ./contrib/pngsuite/iftbbn0g01.png
FAIL: pngimage --list-combos ./contrib/pngsuite/iftbbn0g02.png
FAIL: pngimage --list-combos ./contrib/pngsuite/iftbbn0g04.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbbn2c16.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbbn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbgn2c16.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbgn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbrn2c08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbwn0g16.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbwn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftbyn3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftp0n0g08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftp0n2c08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftp0n3p08.png
PASS: pngimage --list-combos ./contrib/pngsuite/iftp1n3p08.png
FAIL tests/pngimage-quick (exit status: 1)

FAIL: tests/pngimage-full
=========================

./contrib/pngsuite/ibasn0g01.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0xff -> 0x77
./contrib/pngsuite/ibasn0g02.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x9d
./contrib/pngsuite/ibasn0g04.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x20
./contrib/pngsuite/ibasn3p01.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x0f -> 0x07
./contrib/pngsuite/ibasn3p02.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x9d
./contrib/pngsuite/ibasn3p04.png: error(continuable): write(PACKSWAP): byte(0,0) changed 0x00 -> 0x20
./contrib/pngsuite/iftbbn0g01.png: error(continuable): write(PACKSWAP): byte(0,4) changed 0x7f -> 0x00
./contrib/pngsuite/iftbbn0g02.png: error(continuable): write(PACKSWAP): byte(0,4) changed 0x2a -> 0x22
./contrib/pngsuite/iftbbn0g04.png: error(continuable): write(PACKSWAP): byte(6,2) changed 0xff -> 0xcd
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn0g01.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn0g02.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn0g04.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn0g08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn0g16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn2c08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn2c16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn3p01.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn3p02.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn3p04.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn4a08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn4a16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn6a08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/basn6a16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbbn0g01.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbbn0g02.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbbn0g04.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbbn2c16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbbn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbgn2c16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbgn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbrn2c08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbwn0g16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbwn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftbyn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftp0n0g08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftp0n2c08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftp0n3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ftp1n3p08.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn0g01.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn0g02.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn0g04.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn0g08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn0g16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn2c08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn2c16.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn3p01.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn3p02.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn3p04.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn4a08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn4a16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn6a08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/ibasn6a16.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbbn0g01.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbbn0g02.png
FAIL: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbbn0g04.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbbn2c16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbbn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbgn2c16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbgn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbrn2c08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbwn0g16.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbwn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftbyn3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftp0n0g08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftp0n2c08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftp0n3p08.png
PASS: pngimage --exhaustive --list-combos ./contrib/pngsuite/iftp1n3p08.png
FAIL tests/pngimage-full (exit status: 1)

-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}

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