bridge: call br_netpoll_disable in br_add_if

When netdev_set_master faild in br_add_if, we should
call br_netpoll_disable to do some cleanup jobs,such
as free the memory of struct netpoll which allocated
in br_netpoll_enable.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Acked-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_if.c

@@ -366,11 +366,11 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 
 	err = netdev_set_master(dev, br->dev);
 	if (err)
-		goto err3;
+		goto err4;
 
 	err = netdev_rx_handler_register(dev, br_handle_frame, p);
 	if (err)
-		goto err4;
+		goto err5;
 
 	dev->priv_flags |= IFF_BRIDGE_PORT;
 
@@ -402,8 +402,10 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 
 	return 0;
 
-err4:
+err5:
 	netdev_set_master(dev, NULL);
+err4:
+	br_netpoll_disable(p);
 err3:
 	sysfs_remove_link(br->ifobj, p->dev->name);
 err2: