common: suppress log when closing log files

because if xrdp is running 'fork=yes' mode, the log message
'shutting down log subsystem...' is logged everytime when the child
process is exitting. In other words, everytime when clients are
disconnecting.  This is a little bit too vebose.

common/log.c

@@ -198,9 +198,6 @@ internal_log_end(struct log_config *l_cfg)
         return ret;
     }
 
-    /* closing log file */
-    log_message(LOG_LEVEL_ALWAYS, "shutting down log subsystem...");
-
     if (-1 != l_cfg->fd)
     {
         /* closing logfile... */