openssh: use quotes

Signed-off-by: Peter Wagner <tripolar@gmx.at>

net/openssh/files/sshd.init

@@ -22,7 +22,7 @@ start_service() {
 	mkdir -m 0700 -p /var/empty
 
 	local lport=$(awk '/^Port / { print $2; exit }' /etc/ssh/sshd_config)
-	[ -z $lport ] && lport=22
+	[ -z "$lport" ] && lport=22
 
 	procd_open_instance
 	procd_add_mdns "ssh" "tcp" "$lport"