staging: dgap: unwind on error in dgap_tty_register_ports()
- The dgap_tty_register_ports() needs to handle if the tty_port_register_device() fails. Signed-off-by: NDaeseok Youn <daeseok.youn@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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