media: i2c: ov5467: Fixup error path to release mutex

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

"87f3ab9 media: ov5647: Add basic support for multiple sensor modes."
added a return path ov5647_set_fmt that didn't release the device
mutex that it had claimed.
Release the mutex.
Signed-off-by: NDave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/media/i2c/ov5647.c

@@ -1146,8 +1146,10 @@ static int ov5647_set_fmt(struct v4l2_subdev *sd,
 	else
 		mode = mode_8bit;
 
-	if (!mode)
+	if (!mode) {
+		mutex_unlock(&state->lock);
 		return -EINVAL;
+	}
 
 	*fmt = mode->format;
 	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {