disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/net/nsh/nsh.c
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@@ -77,13 +77,12 @@
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 				       netdev_features_t features)
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 {
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 	struct sk_buff *segs = ERR_PTR(-EINVAL);
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+	u16 mac_offset = skb->mac_header;
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 	unsigned int nsh_len, mac_len;
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 	__be16 proto;
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-	int nhoff;
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 	skb_reset_network_header(skb);
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-	nhoff = skb->network_header - skb->mac_header;
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 	mac_len = skb->mac_len;
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 	if (unlikely(!pskb_may_pull(skb, NSH_BASE_HDR_LEN)))
..
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@@ -108,15 +107,14 @@
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 	segs = skb_mac_gso_segment(skb, features);
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 	if (IS_ERR_OR_NULL(segs)) {
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 		skb_gso_error_unwind(skb, htons(ETH_P_NSH), nsh_len,
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-				     skb->network_header - nhoff,
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-				     mac_len);
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+				     mac_offset, mac_len);
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 		goto out;
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 	}
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 	for (skb = segs; skb; skb = skb->next) {
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 		skb->protocol = htons(ETH_P_NSH);
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 		__skb_push(skb, nsh_len);
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-		skb_set_mac_header(skb, -nhoff);
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+		skb->mac_header = mac_offset;
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 		skb->network_header = skb->mac_header + mac_len;
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 		skb->mac_len = mac_len;
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 	}