sky2: Call dev_kfree_skb_any instead of dev_kfree_skb.

Replace dev_kfree_skb with dev_kfree_skb_any in sky2_xmit_frame that
can be called in hard irq and other contexts.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

drivers/net/ethernet/marvell/sky2.c

@@ -2002,7 +2002,7 @@ static netdev_tx_t sky2_xmit_frame(struct sk_buff *skb,
 mapping_error:
 	if (net_ratelimit())
 		dev_warn(&hw->pdev->dev, "%s: tx mapping error\n", dev->name);
-	dev_kfree_skb(skb);
+	dev_kfree_skb_any(skb);
 	return NETDEV_TX_OK;
 }