ipvlan: use netdev_is_rx_handler_busy instead of checking specific type

IPvlan checks if the master device is already used by checking a
specific device (here it's macvlan device). This is technically not
sufficient and it should just ensure the rx_handler is busy or not.
This would be a super check that includes macvlan and any other that
has already registered rx-handler.
Signed-off-by: NMahesh Bandewar <maheshb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ipvlan/ipvlan_main.c

@@ -102,8 +102,8 @@ static int ipvlan_port_create(struct net_device *dev)
 		return -EINVAL;
 	}
 
-	if (netif_is_macvlan_port(dev)) {
-		netdev_err(dev, "Master is a macvlan port.\n");
+	if (netdev_is_rx_handler_busy(dev)) {
+		netdev_err(dev, "Device is already in use.\n");
 		return -EBUSY;
 	}