Fixed bug in coders/png.c that caused -define png:color-space=0 to fail.
Fixed bug in coders/png.c that caused -define png:color-space=0 to fail.


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