ospf6d: remove dead code

* ospf6d/ospf6_interface.c
  * loopind(): sayonara
* ospf6d/ospf6_top.c
  * ospf6_delete(): comment out, it might be useful if real shutdown is
    added
diff --git a/ospf6d/ospf6_top.c b/ospf6d/ospf6_top.c
index c4cc9fa..8237026 100644
--- a/ospf6d/ospf6_top.c
+++ b/ospf6d/ospf6_top.c
@@ -143,6 +143,7 @@
   return o;
 }
 
+#if 0
 static void
 ospf6_delete (struct ospf6 *o)
 {
@@ -163,6 +164,7 @@
 
   XFREE (MTYPE_OSPF6_TOP, o);
 }
+#endif
 
 static void
 ospf6_enable (struct ospf6 *o)