uml/net_kern: Call dev_consume_skb_any instead of dev_kfree_skb.

Replace dev_kfree_skb with dev_consume_skb_any in uml_net_start_xmit
as it can be called in hard irq and other contexts.

dev_consume_skb_any is used as uml_net_start_xmit typically
consumes (not drops) packets.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

arch/um/drivers/net_kern.c

@@ -240,7 +240,7 @@ static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	spin_unlock_irqrestore(&lp->lock, flags);
 
-	dev_kfree_skb(skb);
+	dev_consume_skb_any(skb);
 
 	return NETDEV_TX_OK;
 }