libcamera: v4l2_subdevice: Fix LOG usage

Add the V4L2Subdev category to the last LOG() call requiring it.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/v4l2_subdevice.cpp

@@ -223,7 +223,8 @@ int V4L2Subdevice::setFormat(unsigned int pad, V4L2SubdeviceFormat *format)
 	int ret = ioctl(fd_, VIDIOC_SUBDEV_S_FMT, &subdevFmt);
 	if (ret) {
 		ret = -errno;
-		LOG(Error) << "Unable to set format: " << strerror(-ret);
+		LOG(V4L2Subdev, Error)
+			<< "Unable to set format: " << strerror(-ret);
 		return ret;
 	}