[PATCH v2 0/1] MR7174: mfplat: Introduce a MF startup count.

[Conor McCarthy (＠cmccarthy)]

In cases where MF is already shut down, simply forwarding MFShutdown() to
RtwqShutdown() will corrupt the Rtwq lock count if async result objects
still exist, because they hold a lock. JR East Train Simulator does this.

--
  v2: mf: Release the sample if stream sink processing fails.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7174