Return valid value when falling back to openDemux am: 7633bf9e am:...

Return valid value when falling back to openDemux am: 7633bf9e am: 5f6d96f3 am: 90122b44 am: 7322a6c2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/23149633



Change-Id: Iea8b3a2978e0f83f11ba4b9dec7772e3f3ded7e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>