net: rename skb->iif to skb->skb_iif

To help grep games, rename iif to skb_iif

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 3dd210d..dd3031a 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -343,9 +343,9 @@
 	struct net_device *dev;
 
 	if (indev[0]) {
-		if  (!skb->iif)
+		if  (!skb->skb_iif)
 			return 0;
-		dev = __dev_get_by_index(dev_net(skb->dev), skb->iif);
+		dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif);
 		if (!dev || strcmp(indev, dev->name))
 			return 0;
 	}