rem: *maskptr += sizeof(*a);
add: *maskptr += ALIGN(sizeof(*a));
context: match_different(const STRUCT_ENTRY_MATCH *a,		const unsigned char *a_elems,		const unsigned char *b_elems,		unsigned char **maskptr){	const STRUCT_ENTRY_MATCH *b;	unsigned int i;	/* Offset of b is the same as a. */	b = (void *)b_elems + ((unsigned char *)a - a_elems);	if (a->u.match_size != b->u.match_size)		return 1;	if (strcmp(a->u.user.name, b->u.user.name) != 0)		return 1;	*maskptr += sizeof(*a);	for (i = 0; i < a->u.match_size - sizeof(*a); i++)		if (((a->data[i] ^ b->data[i]) & (*maskptr)[i]) != 0)			return 1;	*maskptr += i;	return 0;}