i2c: Remove all i2c_set_clientdata(client, NULL) in drivers

I2C drivers can use the clientdata-pointer to point to private data. As I2C
devices are not really unregistered, but merely detached from their driver, it
used to be the drivers obligation to clear this pointer during remove() or a
failed probe(). As a couple of drivers forgot to do this, it was agreed that it
was cleaner if the i2c-core does this clearance when appropriate, as there is
no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
This feature was added to the core with commit
e4a7b9b04d to fix the faulty drivers.

As there is no need anymore to clear the clientdata-pointer, remove all current
occurrences in the drivers to simplify the code and prevent confusion.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/macintosh/therm_adt746x.c

@@ -182,7 +182,6 @@ remove_thermostat(struct i2c_client *client)
 
 	thermostat = NULL;
 
-	i2c_set_clientdata(client, NULL);
 	kfree(th);
 
 	return 0;
@@ -400,7 +399,6 @@ static int probe_thermostat(struct i2c_client *client,
 	rc = read_reg(th, CONFIG_REG);
 	if (rc < 0) {
 		dev_err(&client->dev, "Thermostat failed to read config!\n");
-		i2c_set_clientdata(client, NULL);
 		kfree(th);
 		return -ENODEV;
 	}

drivers/macintosh/windfarm_lm75_sensor.c

@@ -107,10 +107,8 @@ static int wf_lm75_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, lm);
 
 	rc = wf_register_sensor(&lm->sens);
-	if (rc) {
-		i2c_set_clientdata(client, NULL);
+	if (rc)
 		kfree(lm);
-	}
 
 	return rc;
 }
@@ -216,7 +214,6 @@ static int wf_lm75_remove(struct i2c_client *client)
 	/* release sensor */
 	wf_unregister_sensor(&lm->sens);
 
-	i2c_set_clientdata(client, NULL);
 	return 0;
 }
 

drivers/macintosh/windfarm_max6690_sensor.c

@@ -81,7 +81,6 @@ static int wf_max6690_probe(struct i2c_client *client,
 
 	rc = wf_register_sensor(&max->sens);
 	if (rc) {
-		i2c_set_clientdata(client, NULL);
 		kfree(max);
 	}
 

drivers/macintosh/windfarm_smu_sat.c

@@ -376,7 +376,6 @@ static int wf_sat_remove(struct i2c_client *client)
 	/* XXX TODO */
 
 	sat->i2c = NULL;
-	i2c_set_clientdata(client, NULL);
 	return 0;
 }