[SKB]: __skb_append = __skb_queue_after 

This expresses __skb_append in terms of __skb_queue_after, exploiting that

  __skb_append(old, new, list) = __skb_queue_after(list, old, new).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 58d8282..2ab350e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1247,7 +1247,7 @@
 						struct sk_buff *buff,
 						struct sock *sk)
 {
-	__skb_append(skb, buff, &sk->sk_write_queue);
+	__skb_queue_after(&sk->sk_write_queue, skb, buff);
 }
 
 /* Insert skb between prev and next on the write queue of sk.  */