ObjFW  Diff

	while (iter != NULL) {
		struct pre_mem *next = iter->next;

		/*
		 * We can use owner as a sentinel to prevent exploitation in
		 * case there is a buffer underflow somewhere.
		 */
		if OF_UNLIKELY (iter->owner != self)
		OF_ENSURE(iter->owner == self);
			abort();

		free(iter);

		iter = next;
	}

	free((char*)self - PRE_IVARS_ALIGN);