android: camera_device: Do not pass nullptr to Request::addBuffer()

The default argument already takes care of passing no fence to
`addBuffer()`, so there is no reason to specify `nullptr` explicitly.

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

src/android/camera_device.cpp

@@ -1079,7 +1079,7 @@ int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Reques
 		buffer.internalBuffer = frameBuffer;
 
 		descriptor->request_->addBuffer(sourceStream->stream(),
-						frameBuffer, nullptr);
+						frameBuffer);
 
 		requestedStreams.insert(sourceStream);
 	}