[finsh] Code cleanup.

components/finsh/msh_cmd.c

@@ -297,8 +297,14 @@ FINSH_FUNCTION_EXPORT_ALIAS(cmd_netstat, __cmd_netstat, list the information of
 int cmd_ps(int argc, char** argv)
 {
     extern long list_thread(void);
-
-    list_thread();
+    extern int list_module(void);
+    
+#ifdef RT_USING_MODULE
+    if ((argc == 2) && (strcmp(argv[1], "-m") == 0))
+        list_module();
+    else
+#endif
+        list_thread();
     return 0;
 }
 FINSH_FUNCTION_EXPORT_ALIAS(cmd_ps, __cmd_ps, List threads in the system.);