[Bug 246208] dev/sound: SNDCTL_DSP_GETPLAYVOL does not work on vchans

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246208

            Bug ID: 246208
           Summary: dev/sound: SNDCTL_DSP_GETPLAYVOL does not work on
                    vchans
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: kevinz5000 at gmail.com

The ioctl SNDCTL_DSP_GETPLAYVOL gets the volume of the given device, see:

http://manuals.opensound.com/developer/SNDCTL_DSP_GETPLAYVOL.html

This ioctl works on clone devices (e.g. /dev/dsp, /dev/dsp0, /dev/dsp0) but
returns EINVAL for vchan devices (e.g. /dev/dsp0.vp0).

It seems to me that this ioctl should work on vchans as well, for example, to
query the volume on virtual channels.

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