superhyway: Handle device_register() retval properly.

static int __init superhyway_init(void)

{

	struct superhyway_bus *bus;

	int ret = 0;

	int ret;

	device_register(&superhyway_bus_device);

	ret = device_register(&superhyway_bus_device);

	if (unlikely(ret))

		return ret;

	for (bus = superhyway_channels; bus->ops; bus++)

		ret |= superhyway_scan_bus(bus);

	return ret;

}

postcore_initcall(superhyway_init);

static const struct superhyway_device_id *