ospf_spf_process_stubs: use LSA pos to find OSFP interface

This is better than a prefix lookup as prefixes may not be
unique, that is, the same prefix can exist on several interfaces.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/ospfd/ospf_route.h b/ospfd/ospf_route.h
index 17ab68e..5742b46 100644
--- a/ospfd/ospf_route.h
+++ b/ospfd/ospf_route.h
@@ -141,7 +141,7 @@
 extern void ospf_intra_add_stub (struct route_table *,
 				 struct router_lsa_link *, struct vertex *,
 				 struct ospf_area *,
-				 int parent_is_root);
+				 int parent_is_root, int);
 
 extern int ospf_route_cmp (struct ospf *, struct ospf_route *,
 			   struct ospf_route *);