[media] et8ek8: Fix compiler / Coccinelle warnings

Fix a compiler warning due to an unused but assigned variable.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/et8ek8/et8ek8_driver.c

@@ -1259,7 +1259,6 @@ et8ek8_registered(struct v4l2_subdev *subdev)
 {
 	struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
 	struct i2c_client *client = v4l2_get_subdevdata(subdev);
-	struct v4l2_mbus_framefmt *format;
 	int rval;
 
 	dev_dbg(&client->dev, "registered!");
@@ -1280,8 +1279,8 @@ et8ek8_registered(struct v4l2_subdev *subdev)
 		goto err_file;
 	}
 
-	format = __et8ek8_get_pad_format(sensor, NULL, 0,
-					 V4L2_SUBDEV_FORMAT_ACTIVE);
+	__et8ek8_get_pad_format(sensor, NULL, 0, V4L2_SUBDEV_FORMAT_ACTIVE);
+
 	return 0;
 
 err_file: