Do not leak tty_driver structure on each module removal. Also do
proper frees in fail paths of module_init.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Cc: Jan Dumon <j.dumon@option.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>