spinand_user_otp_size
if (spinand_user_otp_size(spinand) || spinand_fact_otp_size(spinand)) {
buf->length = user ? spinand_user_otp_size(spinand) :
buf->length = user ? spinand_user_otp_size(spinand) :
size_t spinand_user_otp_size(struct spinand_device *spinand);