When creating the mixers for an USB audio device, the current code looks
at the host interface stored in mixer->chip->ctrl_if. Change this and
rather keep a local pointer to the interface that was given when
snd_usb_create_mixer() was called.
Signed-off-by: NDaniel Mack <zonque@gmail.com>
Reported-by: NNicolai Krakowiak <nicolai.krakowiak@gmail.com>
Reported-by: NLean-Yves LENHOF <jean-yves@lenhof.eu.org>
Acked-by: NClemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: NTakashi Iwai <tiwai@suse.de>