document a hack we want fixed later

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.417 2013/12/27 23:43:39 rpe Exp $
+#	$OpenBSD: rc,v 1.418 2013/12/28 01:00:18 deraadt Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -232,8 +232,10 @@ fi
 if [ X"$1" = X"shutdown" ]; then
 	random_seed
 
+	# XXX If root is writeable, assume we are not single user
 	chmod 600 /etc/random.seed >/dev/null 2>&1
-	_notsingle=$?   # root is writeable, so we are not single user??
+	_notsingle=$?
+
 	if [ ${_notsingle} -eq 0 ]; then
 		if [ -n "${pkg_scripts}" ]; then
 			echo -n 'stopping package daemons:'