Let tty_register_device() return a pointer to the class device it creates.
This allows registrants to add their own sysfs files under the class
device node.
Signed-off-by: NHansjoerg Lipp <hjlipp@web.de>
Signed-off-by: NTilman Schmidt <tilman@imap.cc>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>