sound: Retire pcm_channel->sleeping
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Authored by christos on Tue, Sep 29, 12:26 PM.

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markj
emaste
kib

Summary

This field and the pause_sbt() in pcm_shutdownchans() are redundant now,
because pcm_shutdownchans() (previously part of pcm_killchans()) is now
only responsible for waking up and stopping the channel, and
destroy_dev() will not return until the threads have returned from their
cdev methods.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation