[media] stk1160: unlock on error path stk1160_set_alternate()

There are some unlocks missing on error.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/stk1160/stk1160-v4l.c

@@ -159,8 +159,9 @@ static bool stk1160_set_alternate(struct stk1160 *dev)
 
 static int stk1160_start_streaming(struct stk1160 *dev)
 {
-	int i, rc;
 	bool new_pkt_size;
+	int rc = 0;
+	int i;
 
 	/* Check device presence */
 	if (!dev->udev)
@@ -183,7 +184,7 @@ static int stk1160_start_streaming(struct stk1160 *dev)
 	if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
 		rc = stk1160_alloc_isoc(dev);
 		if (rc < 0)
-			return rc;
+			goto out_unlock;
 	}
 
 	/* submit urbs and enables IRQ */
@@ -192,7 +193,7 @@ static int stk1160_start_streaming(struct stk1160 *dev)
 		if (rc) {
 			stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
 			stk1160_uninit_isoc(dev);
-			return rc;
+			goto out_unlock;
 		}
 	}
 
@@ -205,9 +206,10 @@ static int stk1160_start_streaming(struct stk1160 *dev)
 
 	stk1160_dbg("streaming started\n");
 
+out_unlock:
 	mutex_unlock(&dev->v4l_lock);
 
-	return 0;
+	return rc;
 }
 
 /* Must be called with v4l_lock hold */