[NET]: Kill skb->list

Remove the "list" member of struct sk_buff, as it is entirely
redundant.  All SKB list removal callers know which list the
SKB is on, so storing this in sk_buff does nothing other than
taking up some space.

Two tricky bits were SCTP, which I took care of, and two ATM
drivers which Francois Romieu <romieu@fr.zoreil.com> fixed
up.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index de691e1..b807a31 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -869,7 +869,7 @@
 
 foundit:
 	tx_result(skb->sk, eb->cookie, result);
-	skb_unlink(skb);
+	skb_unlink(skb, &aun_queue);
 	spin_unlock_irqrestore(&aun_queue_lock, flags);
 	kfree_skb(skb);
 }
@@ -947,7 +947,7 @@
 		{
 			tx_result(skb->sk, eb->cookie, 
 				  ECTYPE_TRANSMIT_NOT_PRESENT);
-			skb_unlink(skb);
+			skb_unlink(skb, &aun_queue);
 			kfree_skb(skb);
 		}
 		skb = newskb;