splitmuxsink: Avoid deadlock on release, harder
Unlock after broadcasting and wait for the pad to be free before relocking the muxer, giving the input probe a chance to react to our broadcast.
Improves the fix from !838 (merged).
Unlock after broadcasting and wait for the pad to be free before relocking the muxer, giving the input probe a chance to react to our broadcast.
Improves the fix from !838 (merged).