[automerger skipped] Fix potential overflow when calculating ImageSize am: abc67079b5 am: 241f5b4942 am: c35225fda7 am: ec321070f1 am: d0245bf21d am: b707a4d530 am: 1b5d116366 -s ours

am skip reason: Merged-In I2d7d278f2f2926463513c2abe3a73c012b928225 with SHA-1 2181204216 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/giflib/+/29481376

Change-Id: I56520e99cf11394d569d55b6f55ea171df2d339b
Signed-off-by: Automerger Merge Worker <[email protected]>