bus_print_child_domain
retval += bus_print_child_domain(bus, child);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_domain(rcdev, child);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_domain(dev, child);
int bus_print_child_domain(device_t dev, device_t child);