net: hns3: use macro IANA_VXLAN_GPE_UDP_PORT to replace number 4790

This patch uses macro IANA_VXLAN_GPE_UDP_PORT to replace number 4790 for
cleanup.
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -1302,7 +1302,7 @@ static bool hns3_tunnel_csum_bug(struct sk_buff *skb)
 	if (!(!skb->encapsulation &&
 	      (l4.udp->dest == htons(IANA_VXLAN_UDP_PORT) ||
 	      l4.udp->dest == htons(GENEVE_UDP_PORT) ||
-	      l4.udp->dest == htons(4790))))
+	      l4.udp->dest == htons(IANA_VXLAN_GPE_UDP_PORT))))
 		return false;
 
 	return true;