bridge: Net device leak in br_add_bridge().

In case the register_netdevice() call fails the device is leaked,
since the out: label is just rtnl_unlock()+return.

Free the device.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_if.c

@@ -280,8 +280,10 @@ int br_add_bridge(const char *name)
 	}
 
 	ret = register_netdevice(dev);
-	if (ret)
+	if (ret) {
+		free_netdev(dev);
 		goto out;
+	}
 
 	ret = br_sysfs_addbr(dev);
 	if (ret)