[NET]: Remove explicit initializations of skb->input_dev

Instead, set it in one place, namely the beginning of
netif_receive_skb().

Based upon suggestions from Jamal Hadi Salim.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 4abda6a..b902d24 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -352,10 +352,10 @@
 static inline int
 tcf_match_indev(struct sk_buff *skb, char *indev)
 {
-	if (0 != indev[0]) {
-		if  (NULL == skb->input_dev)
+	if (indev[0]) {
+		if  (!skb->input_dev)
 			return 0;
-		else if (0 != strcmp(indev, skb->input_dev->name))
+		if (strcmp(indev, skb->input_dev->name))
 			return 0;
 	}