[ALSA] usb-audio - remove superfluous parameter

USB generic driver,USB USX2Y
This patch removes the superfluous driver parameter from the
disconnect functions.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/usb/usx2y/usbusx2y.c b/sound/usb/usx2y/usbusx2y.c
index 89ee8b7..e6e6da1 100644
--- a/sound/usb/usx2y/usbusx2y.c
+++ b/sound/usb/usx2y/usbusx2y.c
@@ -442,7 +442,7 @@
 		snd_card_disconnect((snd_card_t*)ptr);
 		/* release the midi resources */
 		list_for_each(p, &usX2Y->chip.midi_list) {
-			snd_usbmidi_disconnect(p, &snd_usX2Y_usb_driver);
+			snd_usbmidi_disconnect(p);
 		}
 		if (usX2Y->us428ctls_sharedmem) 
 			wake_up(&usX2Y->us428ctls_wait_queue_head);