sctp: Bundle HEAERTBEAT into ASCONF_ACK

With this patch a HEARTBEAT chunk is bundled into the ASCONF-ACK
for ADD IP ADDRESS, confirming the new destination as quickly as
possible.

Signed-off-by: Michio Honda <micchie@sfc.wide.ad.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 81db4e3..0121e0a 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3015,6 +3015,7 @@
 		/* Start the heartbeat timer. */
 		if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
 			sctp_transport_hold(peer);
+		asoc->new_transport = peer;
 		break;
 	case SCTP_PARAM_DEL_IP:
 		/* ADDIP 4.3 D7) If a request is received to delete the