ospf: Fix OSPF API and ospf-te LSA refreshers to match recent API change

* ospf_apiserver.{c,h}: (ospf_apiserver_lsa_refresher) refreshers must now
  return the refreshed LSA.
* ospf_te.{c,h}: (ospf_mpls_te_lsa_refresh) ditto
* ospf_api.c: trivial compiler warning fix
diff --git a/ospfd/ospf_te.c b/ospfd/ospf_te.c
index c5ec0ad..24e8105 100644
--- a/ospfd/ospf_te.c
+++ b/ospfd/ospf_te.c
@@ -133,7 +133,7 @@
 static void ospf_mpls_te_config_write_if (struct vty *vty, struct interface *ifp);
 static void ospf_mpls_te_show_info (struct vty *vty, struct ospf_lsa *lsa);
 static int ospf_mpls_te_lsa_originate (void *arg);
-static void ospf_mpls_te_lsa_refresh (struct ospf_lsa *lsa);
+static struct ospf_lsa *ospf_mpls_te_lsa_refresh (struct ospf_lsa *lsa);
 static void ospf_mpls_te_lsa_schedule (struct mpls_te_link *lp, enum sched_opcode);
 
 static void del_mpls_te_link (void *val);
@@ -1009,7 +1009,7 @@
   return rc;
 }
 
-static void
+static struct ospf_lsa *
 ospf_mpls_te_lsa_refresh (struct ospf_lsa *lsa)
 {
   struct mpls_te_link *lp;
@@ -1070,7 +1070,7 @@
     }
 
 out:
-  return;
+  return new;
 }
 
 static void