[automerger skipped] [RESTRICT AUTOMERGE] Fix potential decrypt srcPtr  overflow. am: a7dd68bd2e -s ours am: 0a7ff15094 am: 8dc98947db -s ours am: 2d476ffe5b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/13411281

Change-Id: Ie986f28dd70f02b40bf856320167a1999d252c92