[cleanup] functions taking no args should be declared with void args

Use Ansi-C prototypes rather than old K&R method of declaring
function without arguments
diff --git a/bgpd/bgp_table.c b/bgpd/bgp_table.c
index eb7c9f2..6633256 100644
--- a/bgpd/bgp_table.c
+++ b/bgpd/bgp_table.c
@@ -53,7 +53,7 @@
 }
 
 static struct bgp_node *
-bgp_node_create ()
+bgp_node_create (void)
 {
   return XCALLOC (MTYPE_BGP_NODE, sizeof (struct bgp_node));
 }