[NET]: Kill skb->real_dev

Bonding just wants the device before the skb_bond()
decapsulation occurs, so simply pass that original
device into packet_type->func() as an argument.

It remains to be seen whether we can use this same
exact thing to get rid of skb->input_dev as well.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index a642fd6..6eb9c54 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -700,7 +700,7 @@
 static void parp_redo(struct sk_buff *skb)
 {
 	nf_reset(skb);
-	arp_rcv(skb, skb->dev, NULL);
+	arp_rcv(skb, skb->dev, NULL, skb->dev);
 }
 
 /*
@@ -927,7 +927,7 @@
  *	Receive an arp request from the device layer.
  */
 
-int arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
+int arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 {
 	struct arphdr *arp;