[PATCH 0/1] MR4187: mfmediaengine: Be a bit more conservative with locks in engine Shutdown.

[Yuxuan Shui (＠yshui)]

During engine shutdown we acquire engine lock first, then locks of its constituents (e.g. sample
grabbers); whereas normally the order is the other way around (e.g. timer callback -> acquire sample
grabber lock -> OnProcessSample callback -> engine lock). This is deadlock prone.

With this commit, engine lock is released before we shutdown the inner media session.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/4187