Fix typo in LOG_ERR

Mailman/Logging/Syslog.py

@@ -42,7 +42,7 @@ class _SyslogLogger(object):
             _syslog_initialized = True
         self._priority = real_syslog.LOG_INFO
         if kind == 'error' or kind == 'smtp-failure':
-            self._priority = real_syslog.LOG_ERROR
+            self._priority = real_syslog.LOG_ERR
 
     def write(self, msg):
         real_syslog.syslog(self._priority, msg)