[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/drivers/isdn/act2000/capi.c b/drivers/isdn/act2000/capi.c
index afa4668..6ae6eb3 100644
--- a/drivers/isdn/act2000/capi.c
+++ b/drivers/isdn/act2000/capi.c
@@ -606,7 +606,7 @@
                 if ((((m->msg.data_b3_req.fakencci >> 8) & 0xff) == chan->ncci) &&
 		    (m->msg.data_b3_req.blocknr == blocknr)) {
 			/* found corresponding DATA_B3_REQ */
-                        skb_unlink(tmp);
+                        skb_unlink(tmp, &card->ackq);
 			chan->queued -= m->msg.data_b3_req.datalen;
 			if (m->msg.data_b3_req.flags)
 				ret = m->msg.data_b3_req.datalen;