net: hns3: replace skb->csum_not_inet with skb_csum_is_sctp

Commit fa82117010 ("net: add inline function skb_csum_is_sctp")
missed replacing skb->csum_not_inet check in hns3. This patch is
to replace it with skb_csum_is_sctp().

Reported-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/3ad3c22c08beb0947f5978e790bd98d2aa063df9.1611307861.git.lucien.xin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -1070,7 +1070,7 @@ static bool hns3_check_hw_tx_csum(struct sk_buff *skb)
 	 * HW checksum of the non-IP packets and GSO packets is handled at
 	 * different place in the following code
 	 */
-	if (skb->csum_not_inet || skb_is_gso(skb) ||
+	if (skb_csum_is_sctp(skb) || skb_is_gso(skb) ||
 	    !test_bit(HNS3_NIC_STATE_HW_TX_CSUM_ENABLE, &priv->state))
 		return false;