[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: 371cf68c -s ours am: 7f79460d -s ours am: bb7bbdf9

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

Change-Id: I470fb698534f672daf3d5850230fc6fdd1e47762