Merge "Early return when mA2dp is null (disconnected) to avoid null object...

Merge "Early return when mA2dp is null (disconnected) to avoid null object reference" into udc-dev am: a8fcc09d am: dda28661 am: 1e186b94

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23723003



Change-Id: I76193ecf8249bee5276b01c7e653f9b8c5ea8df5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>