V4L/DVB (7120): videobuf lock is already initialized at videobuf-core.c

Removes the duplicated mutex_init code.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/common/saa7146_vbi.c

@@ -413,7 +413,6 @@ static int vbi_open(struct saa7146_dev *dev, struct file *file)
 			    V4L2_FIELD_SEQ_TB, // FIXME: does this really work?
 			    sizeof(struct saa7146_buf),
 			    file);
-	mutex_init(&fh->vbi_q.lock);
 
 	init_timer(&fh->vbi_read_timeout);
 	fh->vbi_read_timeout.function = vbi_read_timeout;