ALSA: virtuoso: fix setting of Xonar DS line-in/mic-in controls

ALSA: virtuoso: fix setting of Xonar DS line-in/mic-in controls

commit fe6ce80ae25953d95ebaf9bce27b585218cda25c upstream.

The Line and Mic inputs cannot be used at the same time, so the driver
has to automatically disable one of them if both are set.  However, it
forgot to notify userspace about this change, so the mixer state would
be inconsistent.  To fix this, check if the other control gets muted,
and send a notification event in this case.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Reported-and-tested-by: Nathan Schagen
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>