[media] af9015: improve af9015_eeprom_hash()

static int af9015_eeprom_hash(struct dvb_usb_device *d)

{

	struct af9015_state *state = d_to_priv(d);

	int ret;

	static const unsigned int eeprom_size = 256;

	unsigned int reg;

	u8 val, *eeprom;

	struct req_t req = {READ_I2C, AF9015_I2C_EEPROM, 0, 0, 1, 1, &val};

	eeprom = kmalloc(eeprom_size, GFP_KERNEL);

	if (eeprom == NULL)

		return -ENOMEM;

	for (reg = 0; reg < eeprom_size; reg++) {

		req.addr = reg;

	int ret, i;

	static const unsigned int AF9015_EEPROM_SIZE = 256;

	u8 buf[AF9015_EEPROM_SIZE];

	struct req_t req = {READ_I2C, AF9015_I2C_EEPROM, 0, 0, 1, 1, NULL};

	/* read eeprom */

	for (i = 0; i < AF9015_EEPROM_SIZE; i++) {

		req.addr = i;

		req.data = &buf[i];

		ret = af9015_ctrl_msg(d, &req);

		if (ret)

			goto free;

		eeprom[reg] = val;

		if (ret < 0)

			goto err;

	}

	for (reg = 0; reg < eeprom_size; reg += 16)

		dev_dbg(&d->udev->dev, "%s: %*ph\n", __func__, 16,

				eeprom + reg);

	BUG_ON(eeprom_size % 4);

	state->eeprom_sum = 0;

	for (reg = 0; reg < eeprom_size / sizeof(u32); reg++) {

	/* calculate checksum */

	for (i = 0; i < AF9015_EEPROM_SIZE / sizeof(u32); i++) {

		state->eeprom_sum *= GOLDEN_RATIO_PRIME_32;

		state->eeprom_sum += le32_to_cpu(((u32 *)eeprom)[reg]);

		state->eeprom_sum += le32_to_cpu(((u32 *)buf)[i]);

	}

	for (i = 0; i < AF9015_EEPROM_SIZE; i += 16)

		dev_dbg(&d->udev->dev, "%s: %*ph\n", __func__, 16, buf + i);

	dev_dbg(&d->udev->dev, "%s: eeprom sum=%.8x\n",

			__func__, state->eeprom_sum);

	ret = 0;

free:

	kfree(eeprom);

	return 0;

err:

	dev_err(&d->udev->dev, "%s: eeprom failed=%d\n", KBUILD_MODNAME, ret);

	return ret;

}