Fix a small regression reported by nicm@: when domainname is set but

/var/yp/binding does not exist, do _not_ try to start ypbind.
Make it possible to start ypbind the same way as the other daemons
(using ypbind_flags) while preserving the historical startup behavior.
tested by deraadt@

src/etc/rc.conf

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: rc.conf,v 1.162 2011/09/20 15:47:25 ajacoutot Exp $
+#	$OpenBSD: rc.conf,v 1.163 2011/10/07 05:54:48 ajacoutot Exp $
 
 # set these to "NO" to turn them off.  otherwise, they're used as flags
 ldpd_flags=NO		# for normal use: ""
@@ -96,6 +96,7 @@ multicast_router=NO	# A multicast routing daemon will be run, e.g. mrouted
 
 # miscellaneous other flags
 savecore_flags=			# "-z" to compress
+ypbind_flags=NO			# for normal use: ""
 ypserv_flags=NO			# add more flags, eg. -1 for YP v1, -d for DNS etc
 ypldap_flags=NO			# for normal use: ""
 yppasswdd_flags=NO		# "-d /etc/yp" if passwd files are in /etc/yp
@@ -121,7 +122,7 @@ local_rcconf="/etc/rc.conf.local"
 
 unset inetd_flags rwhod_flags portmap_flags kdc_flags kadmind_flags
 unset kpasswdd_flags btd_flags nfsd_flags mountd_flags lockd_flags
-unset statd_flags amd_flags
+unset statd_flags amd_flags ypbind_flags
 
 [ -f ${local_rcconf} ] && . ${local_rcconf} # Do not edit this line
 
@@ -150,3 +151,4 @@ fi
 : ${lockd_flags=$([ X"${lockd-NO}" = XYES ] || echo NO)}
 : ${statd_flags=$([ X"${lockd-NO}" = XYES ] || echo NO)}
 : ${amd_flags=$([ X"${amd-NO}" = XYES ] || echo NO)}
+: ${ypbind_flags=$([ X"`domainname`" != X"" -a -d /var/yp/binding ] || echo NO)}

src/etc/rc.d/ypbind

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $OpenBSD: ypbind,v 1.3 2011/07/08 02:15:34 robert Exp $
+# $OpenBSD: ypbind,v 1.4 2011/10/07 05:54:48 ajacoutot Exp $
 
 daemon="/usr/sbin/ypbind"
 
@@ -10,7 +10,7 @@ rc_bg=YES
 rc_reload=NO
 
 rc_pre() {
-	[ X"`domainname`" != X"" -a -d /var/yp/binding ]
+	[ X"`domainname`" != X"" ]
 }
 
 rc_cmd $1