message: Pass array references correctly in MMR tests
diff: @@ -181,7 +181,7 @@ fn append() {
  peaks.as_ptr(),
  peaks.len(),
  &new_node_data,
  - rt_ret.as_mut_ptr(),
  + &mut rt_ret,
  buf_ret.as_mut_ptr(),
  );
  @@ -220,7 +220,7 @@ fn delete() {
  nodes.as_ptr(),
  peak_count,
  indices.len() - peak_count,
  - rt_ret.as_mut_ptr(),
  + &mut rt_ret,
  );
  // Deleting from full tree of 9 height would result in cascade deleting of 10 nodes
  