um: Use tty_port_operations->destruct

As we setup the SIGWINCH handler in tty_port_operations->activate
it makes sense to tear down it in ->destruct.

Signed-off-by: Richard Weinberger <[e-mail]>

arch/um/drivers/line.c

···
 	return 0;
 }
 
+static void unregister_winch(struct tty_struct *tty);
+
+static void line_destruct(struct tty_port *port)
+{
+	struct tty_struct *tty = tty_port_tty_get(port);
+	struct line *line = tty->driver_data;
+
+	if (line->sigio) {
+		unregister_winch(tty);
+		line->sigio = 0;
+	}
+}
+
 static const struct tty_port_operations line_port_ops = {
 	.activate = line_activate,
+	.destruct = line_destruct,
 };
 
 int line_open(struct tty_struct *tty, struct file *filp)
···
 	tty->driver_data = line;
 
 	return 0;
-}
-
-static void unregister_winch(struct tty_struct *tty);
-
-void line_cleanup(struct tty_struct *tty)
-{
-	struct line *line = tty->driver_data;
-
-	if (line->sigio) {
-		unregister_winch(tty);
-		line->sigio = 0;
-	}
 }
 
 void line_close(struct tty_struct *tty, struct file * filp)

arch/um/drivers/ssl.c

···
 	.throttle 		= line_throttle,
 	.unthrottle 		= line_unthrottle,
 	.install		= ssl_install,
-	.cleanup		= line_cleanup,
 	.hangup			= line_hangup,
 };
 

arch/um/drivers/stdio_console.c

···
 	.set_termios 		= line_set_termios,
 	.throttle 		= line_throttle,
 	.unthrottle 		= line_unthrottle,
-	.cleanup		= line_cleanup,
 	.hangup			= line_hangup,
 };