ipack: ipoctal: rename tty-driver pointer

The name "tty" is typically used for pointers to struct tty_struct.

Rename the tty-driver pointer used during registration to something more
apt to improve readability.

Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210917114622.5412-7-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>