ALSA: usb-audio: Save mixer status only once at suspend

The suspend callback of usb-audio driver may be called multiple times
per suspend when multiple USB interfaces are bound to a single sound
card instance.  In such a case, it's superfluous to save the mixer
values multiple times.  This patch fixes it by checking the counter.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/card.c

@@ -695,6 +695,7 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 			chip->autosuspended = 1;
 	}
 
+	if (chip->num_suspended_intf == 1)
 		list_for_each_entry(mixer, &chip->mixer_list, list)
 			snd_usb_mixer_suspend(mixer);