message: rafs: remove trace which leads to v6 panic
  It is not feasible to implement v6's name(), so with log level being
  trace, the trace! would end up with todo!().
  This avoids the panic by removing it.
diff: @@ -952,7 +952,6 @@ impl RafsInode for OndiskInodeWrapper {
  // Safe to unwrap since it must have child inode.
  if let Some(child_inode) = inode {
  if child_inode.is_dir() {
  - trace!("Got dir {:?}", child_inode.name());
  child_dirs.push(child_inode);
  } else if !child_inode.is_empty_size() && child_inode.is_reg() {
  descendants.push(child_inode);
  