Fix an integer overflow bug in avdt_msg_asmbl am: bf9449a7 am: e49be903 am: cd6e6242

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/23152778



Change-Id: I455ed4dfdfc3e5d45b125eec55ebfb667bafc56a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>