Call Redirection: unbind service when onBind returns null am: c3580d9607 am: 97392ff559

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22183547

Change-Id: If63330bc0eadc13fee72dc0bf142419e89a80063
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>