AudioPolicyManager: Fix memory leak

Refbase objects can leak the weakref_impl if created on the stack.
Fix deviceToAudioPort().

Test: see bug
Bug: 295257845
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5b9a611ed53095a41e3e91b0cebf07701289b4c3)
Merged-In: I7d0363b4a1b725bdfa4949b85eb1a78c8b3d8ace
Change-Id: I7d0363b4a1b725bdfa4949b85eb1a78c8b3d8ace
1 file changed