net: hns3: remove redundant variable 'protocol'

Variable 'protocol' is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'protocol' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -885,7 +885,6 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
 	u16 out_vtag = 0;
 	u32 paylen = 0;
 	u16 mss = 0;
-	__be16 protocol;
 	u8 ol4_proto;
 	u8 il4_proto;
 	int ret;
@@ -914,7 +913,6 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
 
 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
 			skb_reset_mac_len(skb);
-			protocol = skb->protocol;
 
 			ret = hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
 			if (ret)