[Bug 285962] [patch] mixer(8) should honour SOUND_MIXER_READ_DEVMASK result for output

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285962

            Bug ID: 285962
           Summary: [patch] mixer(8) should honour
                    SOUND_MIXER_READ_DEVMASK result for output
           Product: Base System
           Version: 14.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: mail@fbsd2.e4m.org

Created attachment 259393
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=259393&action=edit
patch for diff

I have several machines spitting out something like

mixer: speaker.volume=0.00:0.00: Device not configured

on the console during boot. The reason is:

On shutdown, /etc/rc.d/mixer writes the state of all mixers to /var/db using
"mixer -f ${dev} -o". On reboot, /etc/rc.d/mixer tries to restore the last
state using "mixer -f ${dev} `cat ${file}`".

"mixer -f ${dev}" (with or w/o -o) walks through all devices, not taking
into account if the corresponding device actually exists. The result is that
non-existing devices (and their values) are being saved (in this case
"speaker.volume") and these can't be restored.

This patch fixes this by skipping devices which do not exist.

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