Fix lock removal from active locks list

Author: lutzfischer

dirlock/__init__.py

@@ -40,7 +40,6 @@ def _clean_locks():
     locks_to_release = list(_allActiveLocks)
     for dl in locks_to_release:
         dl.release()
-        _allActiveLocks.remove(dl)
 
 
 def handle_sigint_cleanup(signum, frame):