[PATCH v4 0/3] MR2496: Fix hang when a program calls IMFMediaSession_Start with an invalid source.

[Santino Mazza (＠tati1454)]

This fixes a bug when the session topology contains an invalid
source, which makes the session thread to hang and stop executing
commands.

--
  v4: mf: Handle error when IMFMediaSource_Start fails.
      mf: Handle errors when subscribing to events.
      mf/tests: Test media session error handling.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/2496