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This lets the client free the audio resources when they are not needed. This matches QEMU's behavior. As a side benefit it stops the client's mm-time from being stuck (due to the audio backend's delay updates being applied to the mm-time of the last audio message, that is the channel's creation) when no audio application is running. Signed-off-by: Francois Gouget <fgouget@codeweavers.com>
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