[automerger skipped] Fix crash prone code in BluetoothDeviceManager. am: feca91c0 -s ours am: e85dccce -s ours am: 96e7e0af -s ours

am skip reason: Merged-In I722dded7744759f4485407d5f12e3a57d23b5fbf with SHA-1 ae4876dd is already in history

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/2190075



Change-Id: I341d2c37fbaecbbd23094aa82d751cd65550011e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>