[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_fsm.c b/bgpd/bgp_fsm.c
index 15bd8a6..9248573 100644
--- a/bgpd/bgp_fsm.c
+++ b/bgpd/bgp_fsm.c
@@ -902,7 +902,7 @@
 
 /* Finite State Machine structure */
 struct {
-  int (*func) ();
+  int (*func) (struct peer *);
   int next_state;
 } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = 
 {