[PATCH] tty: Fix TIOCGPTPEER ioctl definition

[David Laight]

From: Linuxppc-dev  Gleb Fotengauer-Malinovskiy
> Sent: 11 July 2017 01:12
> This ioctl does nothing to justify an _IOC_READ or _IOC_WRITE flag
> because it doesn't copy anything from/to userspace to access the
> argument.
> 
> Fixes: 54ebbfb1 ("tty: add TIOCGPTPEER ioctl")
...
> -#define TIOCGPTPEER	_IOR('T', 0x41, int) /* Safely open the slave */
> +#define TIOCGPTPEER	_IO('T', 0x41) /* Safely open the slave */

This is a user API change. When was the ioctl added?

	David