ospfd: interface code should leave  network_lsa_self alone

* ospf_interface.c: (ospf_if_{new,cleanup}) don't touch the network_lsa_self,
  ISM and NSM take care of cleaning it up if needs be + we want to keep
  network_lsa_self around when possible for the the seqnum.

  This shouldn't really make much difference though, particularly as we have
  a separate sequence number memory mechanism.
diff --git a/ospfd/ospf_interface.c b/ospfd/ospf_interface.c
index f9dc4b0..b333658 100644
--- a/ospfd/ospf_interface.c
+++ b/ospfd/ospf_interface.c
@@ -219,9 +219,6 @@
   ospf_add_to_if (ifp, oi);
   listnode_add (ospf->oiflist, oi);
   
-  /* Clear self-originated network-LSA. */
-  oi->network_lsa_self = NULL;
-
   /* Initialize neighbor list. */
   oi->nbrs = route_table_init ();
 
@@ -302,8 +299,6 @@
   oi->nbr_self = ospf_nbr_new (oi);
   ospf_nbr_add_self (oi);
   
-  ospf_lsa_unlock (&oi->network_lsa_self);
-  oi->network_lsa_self = NULL;
   OSPF_TIMER_OFF (oi->t_network_lsa_self);
 }