net: hns: fix return value check in __lb_other_process()

The function skb_copy() could return NULL, the return value
need to be checked.

Fixes: b5996f11 ("net: add Hisilicon Network Subsystem basic ethernet support")
Signed-off-by: NYunjian Wang <wangyunjian@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns/hns_ethtool.c

@@ -415,6 +415,10 @@ static void __lb_other_process(struct hns_nic_ring_data *ring_data,
 	/* for mutl buffer*/
 	new_skb = skb_copy(skb, GFP_ATOMIC);
 	dev_kfree_skb_any(skb);
+	if (!new_skb) {
+		netdev_err(ndev, "skb alloc failed\n");
+		return;
+	}
 	skb = new_skb;
 
 	check_ok = 0;