[DCCP]: Introduce dccp_wait_for_ccid and use it in dccp_write_xmit

This is not quite what I think we should have long term but improves
performance for now, so lets use it till we get CCID3 working well,
then we can think about using sk_write_queue, perhaps using some ideas
from Juwen Lai's old stack for 2.4.20.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index f97e92e..f4da656 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -261,7 +261,7 @@
 	if (rc != 0)
 		goto out_discard;
 
-	rc = dccp_write_xmit(sk, skb, len);
+	rc = dccp_write_xmit(sk, skb, &timeo);
 	/*
 	 * XXX we don't use sk_write_queue, so just discard the packet.
 	 *     Current plan however is to _use_ sk_write_queue with