ptem01 LTP failure in ttydev-0909

[Alan Cox]

> The test changes the window size using the slave-fd and expects that
> it won't affect the window-size on master-fd. With this change, we
> return the slave's window size and test fails.

I've no idea why anyone would have thought the existing behaviour was
correct. The pty/tty pair code tries to share the size and other
information at all times and the old test was I think verifying a bug
existed.

Unless anyone can cite anything to show otherwise anyway ?