Avoid out-of-range memory access
Avoid out-of-range memory access

The commit increase size of a few heap allocations to make sure later
access is not out of bounds.

BUG=aomedia:383

Change-Id: Iadb08faa1e55be361dd3d4adaafeb85cecf23bbb

GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,smarter/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,smarter/aom,luctrudeau/aom