[PATCH v2 0/2] MR10053: mf: Fix crash when stream is null during sample request.

[Brendan McGrath (＠redmcg)]

Windows waits until it receives the MEStreamStarted event(s) before
subscribing to the sink event queues.

This is the successor to MR !9716.

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  v2: mf: Fix crash when stream is null during sample request.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10053