!615 shell命令中rm -r指令尝试删除/dev下节点系统出错

Merge pull request !615 from 高荣鑫/OpenHarmony_1.0.1_release

fs/vfs/vfs_cmd/vfs_shellcmd.c

@@ -838,6 +838,10 @@ static int os_shell_cmd_do_rmdir(const char *pathname)
       return remove(pathname);
     }
   d = opendir(pathname);
+    if (d == NULL)
+    {
+        return -1;
+    }
   while (1)
     {
       dirent = readdir(d);