return dmi_get_system_info(field) ? : "N/A";
char *dmi_data = dmi_get_system_info(field);  return dmi_data && *dmi_data ? dmi_data : "?";
static inline char *i8k_get_dmi_data(int field){	return dmi_get_system_info(field) ? : "N/A";}