net: skb_peek()/skb_peek_tail() cleanups

remove useless casts and rename variables for less confusion.

Signed-off-by: Eric Dumazet <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/skbuff.h

···
  */
 static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_)
 {
-	struct sk_buff *list = ((const struct sk_buff *)list_)->next;
-	if (list == (struct sk_buff *)list_)
-		list = NULL;
-	return list;
+	struct sk_buff *skb = list_->next;
+
+	if (skb == (struct sk_buff *)list_)
+		skb = NULL;
+	return skb;
 }
 
 /**
···
 		const struct sk_buff_head *list_)
 {
 	struct sk_buff *next = skb->next;
+
 	if (next == (struct sk_buff *)list_)
 		next = NULL;
 	return next;
···
  */
 static inline struct sk_buff *skb_peek_tail(const struct sk_buff_head *list_)
 {
-	struct sk_buff *list = ((const struct sk_buff *)list_)->prev;
-	if (list == (struct sk_buff *)list_)
-		list = NULL;
-	return list;
+	struct sk_buff *skb = list_->prev;
+
+	if (skb == (struct sk_buff *)list_)
+		skb = NULL;
+	return skb;
+
 }
 
 /**