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

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

Change-Id: Iaed42cd2c0bee708d786fb8b39092fc5928e1461