[SCSI] sg: convert to kstrtoul_from_user()

sg_proc_write_adio(struct file *filp, const char __user *buffer,

		   size_t count, loff_t *off)

{

	int num;

	char buff[11];

	int err;

	unsigned long num;

	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))

		return -EACCES;

	num = (count < 10) ? count : 10;

	if (copy_from_user(buff, buffer, num))

		return -EFAULT;

	buff[num] = '\0';

	sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;

	err = kstrtoul_from_user(buffer, count, 0, &num);

	if (err)

		return err;

	sg_allow_dio = num ? 1 : 0;

	return count;

}

sg_proc_write_dressz(struct file *filp, const char __user *buffer,

		     size_t count, loff_t *off)

{

	int num;

	int err;

	unsigned long k = ULONG_MAX;

	char buff[11];

	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))

		return -EACCES;

	num = (count < 10) ? count : 10;

	if (copy_from_user(buff, buffer, num))

		return -EFAULT;

	buff[num] = '\0';

	k = simple_strtoul(buff, NULL, 10);

	err = kstrtoul_from_user(buffer, count, 0, &k);

	if (err)

		return err;

	if (k <= 1048576) {	/* limit "big buff" to 1 MB */

		sg_big_buff = k;

		return count;