James Zern bb50bf42b0 pngdec,ReadFunc: throw an error on invalid read
convert the assert() to an error check to avoid crashing when reading
malformed files.

BUG=webp:302

Change-Id: I25eed9cab5c0a439bd3411beacc83f3a27af2bbf
2016-06-22 23:09:30 -07:00
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