r13194 from trunk - don't treat input exhaustion as an error. fixes loading of PNGs where the IDAT size is less than the size of a single scanline.
r13194 from trunk - don't treat input exhaustion as an error. fixes loading of PNGs where the IDAT size is less than the size of a single scanline.

git-svn-id: c0942edff5350604e2827ab28bdfcfa5200fadee@15881 08b3d480-bf2c-0410-a26f-811ee3361c24

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