hwmon: (w83781d) Remove duplicate NULL check

Since i2c_unregister_device() became NULL-aware we may remove duplicate
NULL check.

Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/w83781d.c

@@ -1246,10 +1246,8 @@ w83781d_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
  exit_remove_files:
 	w83781d_remove_files(dev);
-	if (data->lm75[0])
-		i2c_unregister_device(data->lm75[0]);
-	if (data->lm75[1])
-		i2c_unregister_device(data->lm75[1]);
+	i2c_unregister_device(data->lm75[0]);
+	i2c_unregister_device(data->lm75[1]);
 	return err;
 }
 
@@ -1262,10 +1260,8 @@ w83781d_remove(struct i2c_client *client)
 	hwmon_device_unregister(data->hwmon_dev);
 	w83781d_remove_files(dev);
 
-	if (data->lm75[0])
-		i2c_unregister_device(data->lm75[0]);
-	if (data->lm75[1])
-		i2c_unregister_device(data->lm75[1]);
+	i2c_unregister_device(data->lm75[0]);
+	i2c_unregister_device(data->lm75[1]);
 
 	return 0;
 }