[PATCH 0/1] MR5631: mfreadwrite/reader: Shutdown the queue when public ref is released.

[Rémi Bernon]

Instead of internal ref, otherwise an executing callback might be the
one releasing the last ref, and MFUnlockWorkQueue will cancel and then
block waiting for the callback itself to finish executing.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/5631