[isisd] Fix compiler warnings and allow v4-only compilation

2006-12-08 Hannes Gredler <hannes@gredler.at>

	* isis_adjacency.c: (isis_new_adj) Allow NULL snpa argument.
	* isis_pdu.c: (various) Update calls to isis_new_adj() to pass
	  NULL and use default.
	* (general) Add forward declarations where required.
	  Fix up const char *'s.
	  Allow V4-only compilation.
diff --git a/isisd/topology/spgrid.c b/isisd/topology/spgrid.c
index a1aa6d7..611b672 100644
--- a/isisd/topology/spgrid.c
+++ b/isisd/topology/spgrid.c
@@ -26,6 +26,15 @@
 
 #define NODE( x, y ) (x*Y + y + 1)
 
+/*
+ * Prototypes.
+ */
+void free_arc(void *);
+void help(struct vty *);
+void print_arc(struct vty *, struct list *, long, long, long);
+void hhelp(struct vty *);
+void usage(struct vty *);
+
 const char   *graph_type[] =  {
   "double cycle",
   "cycle",