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/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 9402a7f..e054c62 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -171,7 +171,7 @@
 
 static u32 flow_get_iif(const struct sk_buff *skb)
 {
-	return skb->iif;
+	return skb->skb_iif;
 }
 
 static u32 flow_get_priority(const struct sk_buff *skb)