Endless loop in version 1.6.26

This new codeblock in png lib 1.6.26 lead to an endless loop when trying 
to read

https://github.com/MozillaSecurity/fuzzdata/blob/master/samples/png/c-m1-19e0d1d0dfe97dca39e9d449c6b8b3d2.png
from https://github.com/MozillaSecurity/fuzzdata/tree/master/samples/png

             if(!strncmp(png_ptr->zstream.msg,"incorrect data check",20))
             {
                png_chunk_benign_error(png_ptr, "ADLER32 checksum 
mismatch");
                continue;
             }

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