Alexander Kabaev 61698e0ca1 Fix the sound driver vchan support to work when hw.snd.maxautovchans
has been specified through /boot/loader.conf as opposed to setting it
in /etc/sysctl.conf. Only PCMDIR_PLAY channel can be used as a parent
of virtual channel. Do not initialize a new vchan for a given physical
channel if other physical channel already has one created.

PR:	31597
Approved by:	obrien (mentor)
2002-07-23 14:50:51 +00:00
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