ACPI: property: use cached name in acpi_fwnode_get_named_child_node()

acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,

				 const char *childname)

{

	char name[ACPI_PATH_SEGMENT_LENGTH];

	struct fwnode_handle *child;

	struct acpi_buffer path;

	acpi_status status;

	path.length = sizeof(name);

	path.pointer = name;

	fwnode_for_each_child_node(fwnode, child) {

		if (is_acpi_data_node(child)) {

			continue;

		}

		status = acpi_get_name(ACPI_HANDLE_FWNODE(child),

				       ACPI_SINGLE_NAME, &path);

		if (ACPI_FAILURE(status))

			break;

		if (!strncmp(name, childname, ACPI_NAMESEG_SIZE))

		if (!strncmp(acpi_device_bid(to_acpi_device_node(child)),

			     childname, ACPI_NAMESEG_SIZE))

			return child;

	}