James Zern e375080d8f gifdec,Remap: avoid out of bounds colormap read
make this function return success/failure.
an empty map or out of bounds read is treated as an error.

BUG=webp:316

Change-Id: Ic8651836915ea4dd8e0dc81ca8d5d3f247be1ff8
(cherry picked from commit cac9a36a23fe538370a9f308d564c2eec39e487d)
2016-11-02 23:10:22 -07:00
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