net: skb_needs_check() removes CHECKSUM_UNNECESSARY check for tx.

Because we remove the UFO support, we will also remove the
CHECKSUM_UNNECESSARY check in skb_needs_check().

Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: NTonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -2731,8 +2731,7 @@ EXPORT_SYMBOL(skb_mac_gso_segment);
 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
 {
 	if (tx_path)
-		return skb->ip_summed != CHECKSUM_PARTIAL &&
-		       skb->ip_summed != CHECKSUM_UNNECESSARY;
+		return skb->ip_summed != CHECKSUM_PARTIAL;
 
 	return skb->ip_summed == CHECKSUM_NONE;
 }