Fixed a typo in variable name. Thanks PyFlakes.

(Redmine issue: #7121)

lib/mentat/daemon/component/filer.py

@@ -203,7 +203,7 @@ class FilerDaemonComponent(pyzenkit.zendaemon.ZenDaemonComponent):  # pylint: di
 
     def _check_workdir_writability(self, daemon, dir_name):
         if not os.path.isdir(self.queue_out_dir):
-            msg = "Work directory '{}' does not exist".format(dirname)
+            msg = "Work directory '{}' does not exist".format(dir_name)
             daemon.logger.error("[STATUS] Component '{}': {}".format(self.cid, msg))
             raise pyzenkit.zendaemon.ZenDaemonComponentException(msg)
         if not os.access(dir_name, os.W_OK):