atl1c: remove open-coded skb_cow_head.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Jay Cliburn <jcliburn@gmail.com>
Cc: Chris Snook <chris.snook@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/atheros/atl1c/atl1c_main.c

@@ -1973,17 +1973,17 @@ static int atl1c_tso_csum(struct atl1c_adapter *adapter,
 			  enum atl1c_trans_queue type)
 {
 	struct pci_dev *pdev = adapter->pdev;
+	unsigned short offload_type;
 	u8 hdr_len;
 	u32 real_len;
-	unsigned short offload_type;
-	int err;
 
 	if (skb_is_gso(skb)) {
-		if (skb_header_cloned(skb)) {
-			err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
-			if (unlikely(err))
-				return -1;
-		}
+		int err;
+
+		err = skb_cow_head(skb, 0);
+		if (err < 0)
+			return err;
+
 		offload_type = skb_shinfo(skb)->gso_type;
 
 		if (offload_type & SKB_GSO_TCPV4) {