bridge: Consolidate error paths in br_add_bridge().

This actually had to be merged with the patch #1, but I decided not to
mix two changes in one patch.

There are already two calls to free_netdev() in there, so merge them
into one.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_if.c

@@ -273,24 +273,24 @@ int br_add_bridge(const char *name)
 	rtnl_lock();
 	if (strchr(dev->name, '%')) {
 		ret = dev_alloc_name(dev, dev->name);
-		if (ret < 0) {
-			free_netdev(dev);
-			goto out;
-		}
+		if (ret < 0)
+			goto out_free;
 	}
 
 	ret = register_netdevice(dev);
-	if (ret) {
-		free_netdev(dev);
-		goto out;
-	}
+	if (ret)
+		goto out_free;
 
 	ret = br_sysfs_addbr(dev);
 	if (ret)
 		unregister_netdevice(dev);
  out:
 	rtnl_unlock();
 	return ret;
+
+out_free:
+	free_netdev(dev);
+	goto out;
 }
 
 int br_del_bridge(const char *name)