iio: dac: mcp4725: Replace variable 'id' from struct mcp4725_data

Replace the variable 'id' from struct mcp4725_data with local variable
chip_id in probe() as the id variable is not used elsewhere in the
driver.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230903115548.59306-2-biju.das.jz@bp.renesas.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/mcp4725.c

@@ -32,7 +32,6 @@
 
 struct mcp4725_data {
 	struct i2c_client *client;
-	int id;
 	unsigned ref_mode;
 	bool vref_buffered;
 	u16 dac_value;
@@ -387,6 +386,7 @@ static int mcp4725_probe(struct i2c_client *client)
 	struct mcp4725_data *data;
 	struct iio_dev *indio_dev;
 	struct mcp4725_platform_data *pdata, pdata_dt;
+	int chip_id;
 	u8 inbuf[4];
 	u8 pd;
 	u8 ref;
@@ -399,9 +399,9 @@ static int mcp4725_probe(struct i2c_client *client)
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
 	if (dev_fwnode(&client->dev))
-		data->id = (uintptr_t)device_get_match_data(&client->dev);
+		chip_id = (uintptr_t)device_get_match_data(&client->dev);
 	else
-		data->id = id->driver_data;
+		chip_id = id->driver_data;
 	pdata = dev_get_platdata(&client->dev);
 
 	if (!pdata) {
@@ -414,7 +414,7 @@ static int mcp4725_probe(struct i2c_client *client)
 		pdata = &pdata_dt;
 	}
 
-	if (data->id == MCP4725 && pdata->use_vref) {
+	if (chip_id == MCP4725 && pdata->use_vref) {
 		dev_err(&client->dev,
 			"external reference is unavailable on MCP4725");
 		return -EINVAL;
@@ -455,12 +455,12 @@ static int mcp4725_probe(struct i2c_client *client)
 
 	indio_dev->name = id->name;
 	indio_dev->info = &mcp4725_info;
-	indio_dev->channels = &mcp472x_channel[id->driver_data];
+	indio_dev->channels = &mcp472x_channel[chip_id];
 	indio_dev->num_channels = 1;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	/* read current DAC value and settings */
-	err = i2c_master_recv(client, inbuf, data->id == MCP4725 ? 3 : 4);
+	err = i2c_master_recv(client, inbuf, chip_id == MCP4725 ? 3 : 4);
 
 	if (err < 0) {
 		dev_err(&client->dev, "failed to read DAC value");
@@ -470,10 +470,10 @@ static int mcp4725_probe(struct i2c_client *client)
 	data->powerdown = pd > 0;
 	data->powerdown_mode = pd ? pd - 1 : 2; /* largest resistor to gnd */
 	data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4);
-	if (data->id == MCP4726)
+	if (chip_id == MCP4726)
 		ref = (inbuf[3] >> 3) & 0x3;
 
-	if (data->id == MCP4726 && ref != data->ref_mode) {
+	if (chip_id == MCP4726 && ref != data->ref_mode) {
 		dev_info(&client->dev,
 			"voltage reference mode differs (conf: %u, eeprom: %u), setting %u",
 			data->ref_mode, ref, data->ref_mode);