[Bug 40734] Unreal Tournament 3 doesn' t quit properly when Pulseaudio is used

https://bugs.winehq.org/show_bug.cgi?id=40734

--- Comment #2 from Andrew Eikum  ---
This happens because we're holding a chunk of memory from pa_stream_peek that
we don't release until we've finished copying it in a later call to
pulse_rd_loop. That later call never happens, so the memory reference is never
released, and PA refuses to shutdown until we let it go.

Probably we should just copy the unused portion and never hold a reference
between pulse_rd_loop calls.