This patch adds definition of tty_open_by_driver when CONFIG_TTY is not
defined. This was supposed to have been included in commit
12e84c71 ("tty: export
tty_open_by_driver"). The patch follows convention for other such
functions and returns NULL.
Signed-off-by: NOkash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>