sctp: fix oops when updating retransmit path with DEBUG on

commit fbdf501c9374966a56829ecca3a7f25d2b49a305
  sctp: Do no select unconfirmed transports for retransmissions

Introduced the initial falt.

commit d598b166ced20d9b9281ea3527c0e18405ddb803
  sctp: Make sure we always return valid retransmit path

Solved the problem, but forgot to change the DEBUG statement.
Thus it was still possible to dereference a NULL pointer.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/associola.c

@@ -1323,6 +1323,8 @@ void sctp_assoc_update_retran_path(struct sctp_association *asoc)
 
 	if (t)
 		asoc->peer.retran_path = t;
+	else
+		t = asoc->peer.retran_path;
 
 	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
 				 " %p addr: ",