message: One more cleanup
diff: @@ -133,19 +133,19 @@ impl Iterator for ExternalIterator {
  type Item = KV;
  fn next(&mut self) -> Option<Self::Item> {
  - let key = alloc(MAX_READ);
  - let value = alloc(MAX_READ);
  + let key_ptr = alloc(MAX_READ);
  + let value_ptr = alloc(MAX_READ);
  - let read = unsafe { next_db(key, value) };
  + let read = unsafe { next_db(key_ptr, value_ptr) };
  if read < 0 {
  panic!(format!("Unknown error on next: {}", read));
  }
  - let key = unsafe { consume_region(key).unwrap() };
  + let key = unsafe { consume_region(key_ptr).unwrap() };
  if key.is_empty() {
  return None;
  }
  - let value = unsafe { consume_region(value).unwrap() };
  + let value = unsafe { consume_region(value_ptr).unwrap() };
  Some((key, value))
  }
  }
  