Don't fail on unlock if we're not even emulating FBE

As a precaution, we do the work of emulating an unlock even on devices
that aren't emulating FBE. However, we don't care if it fails, so
don't fail the calling command in that instance.

Bug: 26713622
Change-Id: I8c5fb4b9a130335ecbb9b8ea6367f1c59835c0f1
1 file changed