rem: status = AcpiEvaluateObject(NULL,object,NULL,&buffer);
add: status = AcpiEvaluateObject(NULL,object,NULL,(return_value != NULL) ? &buffer : NULL);
context: status_t evaluate_object (const char *object, void *return_value, size_t buf_len) {	ACPI_BUFFER buffer;	ACPI_STATUS status;		buffer.Pointer = return_value;	buffer.Length = buf_len;		status = AcpiEvaluateObject(NULL,object,NULL,&buffer);	return (status == AE_OK) ? B_OK : B_ERROR;}