Merge branch 'en/dir-traversal'

Fix-up to a topic that is already in 'master'. * en/dir-traversal: dir: introduce readdir_skip_dot_and_dotdot() helper dir: update stale description of treat_directory() Revert "dir: update stale description of treat_directory()" Revert "dir: introduce readdir_skip_dot_and_dotdot() helper"