media: adv7511-v4l2: fix compile error

This patch fixes compile error as below:

drivers/media/i2c/adv7511-v4l2.c:416:9: error: ‘return’ with a value, in function returning void [-Werror=return-type]
  416 |  return 0;
      |         ^

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>

drivers/media/i2c/adv7511-v4l2.c

@@ -424,7 +424,7 @@ static void adv7511_set_rgb_quantization_mode(struct v4l2_subdev *sd, struct v4l
 	struct adv7511_state *state = get_adv7511_state(sd);
 
 #ifdef XYLON_LOGICVC_INTG
-	return 0;
+	return;
 #endif
 
 	/* Only makes sense for RGB formats */