Changed "if (something)" to "if (something != 0)" in coders/png.c
Changed "if (something)" to "if (something != 0)" in coders/png.c


Danack/ImageMagick,kwm81/ImageMagick,kwm81/ImageMagick,Danack/ImageMagick,kwm81/ImageMagick,UniQP/ImageMagick,Danack/ImageMagick,UniQP/ImageMagick,UniQP/ImageMagick,UniQP/ImageMagick,Danack/ImageMagick,UniQP/ImageMagick,UniQP/ImageMagick,kwm81/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,kwm81/ImageMagick,kwm81/ImageMagick