CheckPinholeWorkingArgs = calloc(4, sizeof(struct UPNParg));   // memory allocated here
	if(CheckPinholeWorkingArgs == NULL)
		return UPNPCOMMAND_MEM_ALLOC_ERROR;
	CheckPinholeWorkingArgs[0].elt = "UniqueID";
	CheckPinholeWorkingArgs[0].val = uniqueID;
	buffer = simpleUPnPcommand(-1, controlURL, servicetype,
	                           "CheckPinholeWorking", CheckPinholeWorkingArgs, &bufsize);
	if(!buffer)         // if this if expression take true block, the previous allocated CheckPinholeWorkingArgs will not be freed.
		return UPNPCOMMAND_HTTP_ERROR;