Correctly skip the internal fd when checking the server sockets. Use PFD_MAX

to start the for loop and not 1 which was correct long long time ago.
OK otto@ found by Anirban Sinha ASinha(at)zeugmasystems.com

src/usr.sbin/ntpd/ntp.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntp.c,v 1.108 2008/10/02 14:00:21 henning Exp $ */
+/*	$OpenBSD: ntp.c,v 1.109 2008/12/10 09:03:30 claudio Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -344,7 +344,7 @@ ntp_main(int pipe_prnt[2], struct ntpd_conf *nconf, struct passwd *pw)
 			sensor_hotplugevent(hotplugfd);
 		}
 
-		for (j = 1; nfds > 0 && j < idx_peers; j++)
+		for (j = PFD_MAX; nfds > 0 && j < idx_peers; j++)
 			if (pfd[j].revents & (POLLIN|POLLERR)) {
 				nfds--;
 				if (server_dispatch(pfd[j].fd, conf) == -1)