atl1: remove open-coded skb_cow_head.

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

drivers/net/ethernet/atheros/atlx/atl1.c

@@ -2122,14 +2122,13 @@ static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
 {
 	u8 hdr_len, ip_off;
 	u32 real_len;
-	int err;
 
 	if (skb_shinfo(skb)->gso_size) {
-		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;
 
 		if (skb->protocol == htons(ETH_P_IP)) {
 			struct iphdr *iph = ip_hdr(skb);
@@ -2175,7 +2174,7 @@ static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
 			return 3;
 		}
 	}
-	return false;
+	return 0;
 }
 
 static int atl1_tx_csum(struct atl1_adapter *adapter, struct sk_buff *skb,