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

Return valid value when falling back to openDemux am: 7633bf9e am: 9ab8a3d3 am: a70dcb93 am: 8395e8f8

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



Change-Id: I15483fc82c2dc9071b3a4000ae1811a8acc9e8c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>