pimd: mask unused zclient_broken()

this function is used by the currently not present zclient reconnect
code.  It'll be unmasked again when that code hits master.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/pimd/pim_zebra.c b/pimd/pim_zebra.c
index 6f241d5..129cbe4 100644
--- a/pimd/pim_zebra.c
+++ b/pimd/pim_zebra.c
@@ -51,6 +51,7 @@
 		   struct interface *oif,
 		   uint32_t proto_mask);
 
+#if 0
 static void zclient_broken(struct zclient *zclient)
 {
   struct listnode  *ifnode;
@@ -65,6 +66,7 @@
 
   /* upon return, zclient will discard connected addresses */
 }
+#endif
 
 /* Router-id update message from zebra. */
 static int pim_router_id_update_zebra(int command, struct zclient *zclient,