Merge "audio policy: protect against null input device selection" into udc-dev am: a8ba2a1f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22191042



Change-Id: Ic183438e93a33a12415b1bd67447dc8d4e46e042
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>