BUG: Converting GIF to PNG fails with SIGSEGV

Hi,

I think I found another bug in GraphicsMagick. I tried 1.2.3 first, then 
latest CVS.

$ strace gm convert pixel_black.gif a.png 
...
access("/usr/local/lib/GraphicsMagick-1.3/modules-Q8/coders/png.la", R_OK) 
= -1 ENOENT (No such file or directory)
access("/usr/local/lib/GraphicsMagick-1.3/modules-Q8/coders/png.la", R_OK) 
= -1 ENOENT (No such file or directory)
open("a.png", O_RDWR|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0xb7f87000
read(3, "", 4096)                       = 0
_llseek(3, 0, [0], SEEK_SET)            = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (2) ---
+++ killed by SIGSEGV +++
Process 14372 detached
$

Converting anything other than a GIF to PNG works, same with GIF to anything 
other than PNG. Strange bug.

The attached GIF image made with GIMP demonstrates the bug. But it works with 
other GIF images I have here, too.

Kind regards

	Jan
-- 
If Bill Gates had a nickel for every time Windows crashed...
Oh wait, he does.

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