[automerger skipped] leaudio/testapp: Fix crash on registering callbacks am: 397f0dc8 am: 845fef7a -s ours

am skip reason: Merged-In I28a371af6b1f6f052bfc03d972c358f5c5427ce0 with SHA-1 397f0dc8 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/19133810



Change-Id: Ic2fa3a8f4379a4cbd20672e2c4cdefc480a303f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>