Fixed django#19254 -- Bug in SESSION_FILE_PATH handling.

Thanks simonb for the report. Refs django#18194.

Author: aaugustin

django/contrib/sessions/backends/file.py

@@ -176,7 +176,7 @@ def clean(self):
 
  @classmethod
  def clear_expired(cls):
- storage_path = getattr(settings, "SESSION_FILE_PATH", tempfile.gettempdir())
+ storage_path = cls._get_storage_path()
  file_prefix = settings.SESSION_COOKIE_NAME
 
  for session_file in os.listdir(storage_path):