message: FAPL: fix a segfault in get_mdc_log_options()
diff: @@ -1704,7 +1704,7 @@ impl FileAccess {
  self.id(),
  &mut is_enabled,
  buf.as_mut_ptr(),
  - ptr::null_mut(),
  + &mut location_size,
  &mut start_on_access
  ));
  Ok(CacheLogOptions {
  