tty: Wait for SAK work before waiting for hangup work

SAK work may schedule hangup work (if TTY_SOFT_SAK is defined), thus
SAK work must be flushed before hangup work.
Signed-off-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_ldisc.c

@@ -506,8 +506,8 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
  */
 static void tty_ldisc_flush_works(struct tty_struct *tty)
 {
-	flush_work(&tty->hangup_work);
 	flush_work(&tty->SAK_work);
+	flush_work(&tty->hangup_work);
 	flush_work(&tty->port->buf.work);
 }