Merge "blueooth/audio/aidl/default: Fix return code in startSession" into main am: 48fc8ec666

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3515851

Change-Id: I9f8d5e9e267321ae5c1fdfdd07a4fd7307ac2f73
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>