in ReadAnimatedWebP() & ReadAnimatedGIF() when AllocateFrames() fails
due to OOM
Tested:
for i in `seq 1 278`; do
export MALLOC_FAIL_AT=$i
./examples/anim_diff webp1 webp2
./examples/anim_diff gif1 gif2
done
Change-Id: I5d486c2c2982ae088e34a25d8e3e0188df1a9b51