net: hns3: remove redundant assignment of l2_hdr to itself

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

The pointer l2_hdr is being assigned to itself, this is redundant
and can be removed.

fix from community.

Feature or Bugfix:Bugfix
Signed-off-by: NYunsheng Lin <linyunsheng@huawei.com>
Reviewed-by: Nlipeng <lipeng321@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

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

@@ -862,7 +862,7 @@ static int hns3_set_l2l3l4(struct sk_buff *skb, u8 ol4_proto,
 			   u8 il4_proto, u32 *type_cs_vlan_tso,
 			   u32 *ol_type_vlan_len_msec)
 {
-	unsigned char *l2_hdr = l2_hdr = skb->data;
+	unsigned char *l2_hdr = skb->data;
 	u32 l4_proto = ol4_proto;
 	union l4_hdr_info l4;
 	union l3_hdr_info l3;