sfc: cleanup a condition in efx_udp_tunnel_del()

Presumably if there is an "add" function, there is also a "del"
function.  But it causes a static checker warning because it looks like
a common cut and paste bug.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/efx.c

@@ -2404,7 +2404,7 @@ static void efx_udp_tunnel_del(struct net_device *dev, struct udp_tunnel_info *t
 	tnl.type = (u16)efx_tunnel_type;
 	tnl.port = ti->port;
 
-	if (efx->type->udp_tnl_add_port)
+	if (efx->type->udp_tnl_del_port)
 		(void)efx->type->udp_tnl_del_port(efx, tnl);
 }