bnx2x: added 'likely' to fast-path skb existence

Signed-off-by: NYuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: NEilon Greenstein <eilong@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c

@@ -120,10 +120,11 @@ static u16 bnx2x_free_tx_pkt(struct bnx2x *bp, struct bnx2x_fp_txdata *txdata,
 
 	/* release skb */
 	WARN_ON(!skb);
-	if (skb) {
+	if (likely(skb)) {
 		(*pkts_compl)++;
 		(*bytes_compl) += skb->len;
 	}
+
 	dev_kfree_skb_any(skb);
 	tx_buf->first_bd = 0;
 	tx_buf->skb = NULL;