rem: iterator->prefix = strdup(prefix);
add: iterator->prefix = strdup(prefix ? prefix : "");
context: open_module_list(const char *prefix){	module_iterator *iterator;	TRACE(("open_module_list(prefix = %s)\n", prefix));	iterator = (module_iterator *)malloc(sizeof( module_iterator));	if (!iterator)		return NULL;	// ToDo: possibly, the prefix don't have to be copied, just referenced	iterator->prefix = strdup(prefix);	if (iterator->prefix == NULL) {		free(iterator);		return NULL;	}	iterator->base_path_id = -1;	iterator->base_dir = iterator->cur_dir = NULL;	iterator->err = B_NO_ERROR;	iterator->module_pos = 0;	return (void *)iterator;}