James Zern 883d41fb40 gif2webp: fix crash with NULL extension data
DGifGetExtension() may successfully return, but the data pointer should
still be validated

BUG=webp:310

Change-Id: I6cfe617871fef2fe07887e5f48bb20f7ab7cfb35
(cherry picked from commit 806f6279aef4de8deca01c8e727db4a508716e95)
2016-11-02 23:09:49 -07:00
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