resolves #10548 - `FLANN::knnSearch` garbage bug (when kNN is larger than the dataset size)
resolves #10548 - `FLANN::knnSearch` garbage bug (when kNN is larger than the dataset size)

opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv