efivar_get_next_variable
status = efivar_get_next_variable(&varname_size, varname, &guid);
EXPORT_SYMBOL_NS_GPL(efivar_get_next_variable, "EFIVAR");
status = efivar_get_next_variable(&variable_name_size,
efi_status_t efivar_get_next_variable(unsigned long *name_size,