[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/isis_tlv.c b/isisd/isis_tlv.c
index 7b99ab5..94fa65e 100644
--- a/isisd/isis_tlv.c
+++ b/isisd/isis_tlv.c
@@ -45,6 +45,11 @@
 
 extern struct isis *isis;
 
+/*
+ * Prototypes.
+ */
+int add_tlv (u_char, u_char, u_char *, struct stream *);
+
 void
 free_tlv (void *val)
 {