Fix out of bounds memory read in GIFMovie.cpp am: 16882f7212 am: d2456e3a12 am: ffc0958605 am: df18259ff1 am: c9b947def7 am: 09ad23b21e am: 716de6b276 am: d1fb426850 am: d80a31cff8
am: 8b8fbb1e9c

Change-Id: Ib7c6b97e043c6c4b190ee045281e34159f084c28