[automerger skipped] [RESTRICT AUTOMERGE] Fix potential decrypt srcPtr ...

[automerger skipped] [RESTRICT AUTOMERGE] Fix potential decrypt srcPtr  overflow. am: a7dd68bd -s ours am: 0a7ff150 am: 8dc98947 -s ours am: 2d476ffe am: 0f9aa4d2 -s ours am: 69124fa3 -s ours am: c1de575a

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

Change-Id: I2be45f3bf9a0666b1d30697c63e2e6a2454d8d02