Commit 
0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
        ntc_iio_channel_release(pdata);
-       platform_set_drvdata(pdev, NULL);
 
        return 0;
 }