[Bug 194727] uaudio device gets disconnected, and hangs usb until everything using /dev/mixer* is closed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194727

--- Comment #35 from rozhuk.im at gmail.com ---
Created attachment 218672
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218672&action=edit
mixer patch

This is patch for mixer to allow USB stack continue work on opened usb sound
dev unplug.
It helps in most cases, except sound dev unpluged then dsp is open.

I did not test for race, as HPS pointed in https://reviews.freebsd.org/D11140

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