media: i2c: remove unneeded variable 'ret'

Fix the following coccicheck warning:
./drivers/media/i2c/ov8865.c:2527:5-8: Unneeded variable: "ret". Return
"0" on line 2536
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov8865.c

@@ -2524,7 +2524,6 @@ static int ov8865_g_frame_interval(struct v4l2_subdev *subdev,
 {
 	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
 	const struct ov8865_mode *mode;
-	int ret = 0;
 
 	mutex_lock(&sensor->mutex);
 
@@ -2533,7 +2532,7 @@ static int ov8865_g_frame_interval(struct v4l2_subdev *subdev,
 
 	mutex_unlock(&sensor->mutex);
 
-	return ret;
+	return 0;
 }
 
 static const struct v4l2_subdev_video_ops ov8865_subdev_video_ops = {