[automerge] Fix Out of Bounds Read in AAVCAssembler 2p: 3066b1410d am: 5a884e0659 am: 17aac56edd am: 606775f053 am: 69d0544b26

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/20540194

Change-Id: Idadb71b9d2490f76896964a4ac615db20f804668
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>