Extend CenterChooser initialization

Set DataSize (cols_) when loading an index

Author: trebor8x

src/cpp/flann/algorithms/hierarchical_clustering_index.h

@@ -128,6 +128,8 @@ class HierarchicalClusteringIndex : public NNIndex<Distance>
         initCenterChooser();
 
         setDataset(inputData);
+
+        chooseCenters_->setDataSize(veclen_);
     }