[automerger skipped] C2SoftOpusEnc: Fix integer overflows leading to crash by...

[automerger skipped] C2SoftOpusEnc: Fix integer overflows leading to crash by changing data type am: b76f40ec -s ours am: 17f7ba6b -s ours

am skip reason: Merged-In I72fee83ae27d3f446b1584fd4fd047e93a0a01d9 with SHA-1 d6ec069c is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/17108365

Change-Id: I36dd1c6cdb36c7ebf882f62f17b4c2adc0b4e796