V4L/DVB: gspca - sn9c20x: Correct onstack wait_queue_head declaration

Use DECLARE_WAIT_QUEUE_HEAD_ONSTACK to make lockdep happy
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
CC: Brian Johnson <brijohn@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/sn9c20x.c

@@ -1427,7 +1427,7 @@ static int input_kthread(void *data)
 	struct gspca_dev *gspca_dev = (struct gspca_dev *)data;
 	struct sd *sd = (struct sd *) gspca_dev;
 
-	DECLARE_WAIT_QUEUE_HEAD(wait);
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait);
 	set_freezable();
 	for (;;) {
 		if (kthread_should_stop())