Fix two issues:

- Check for rc.d directory's existence before traversing
   it;
 - Don't output * when rc.d directory is empty.

PR:		conf/190665
Submitted by:	Oleg Ginzburg <olevole olevole ru> (with changes)
MFC after:	2 weeks

usr.sbin/service/service.sh

@@ -109,7 +109,7 @@ fi
 if [ -n "$LIST" ]; then
 	for dir in /etc/rc.d $local_startup; do
 		[ -n "$VERBOSE" ] && echo "From ${dir}:"
-		cd $dir && for file in *; do echo $file; done
+		[ -d ${dir} ] && /bin/ls -1 ${dir}
 	done
 	exit 0
 fi