bgp: compiler warning fix
* bgp_filter.h: Gcc complains the function prototype is not correct because
the function argument is using old K&R style.
diff --git a/bgpd/bgp_filter.h b/bgpd/bgp_filter.h
index 8c27a93..c1da904 100644
--- a/bgpd/bgp_filter.h
+++ b/bgpd/bgp_filter.h
@@ -33,7 +33,7 @@
extern enum as_filter_type as_list_apply (struct as_list *, void *);
extern struct as_list *as_list_lookup (const char *);
-extern void as_list_add_hook (void (*func) ());
-extern void as_list_delete_hook (void (*func) ());
+extern void as_list_add_hook (void (*func) (void));
+extern void as_list_delete_hook (void (*func) (void));
#endif /* _QUAGGA_BGP_FILTER_H */