Fix: freeing previous elements has to be done before loading new parameters to…

Fix: freeing previous elements has to be done before loading new parameters to avoid trying to delete unexisting objects if arrays size was modified
(cherry picked from commit 3f458c6e)

modules/flann/include/opencv2/flann/hierarchical_clustering_index.h

@@ -414,12 +414,6 @@ public:
 
     void loadIndex(FILE* stream)
     {
-        load_value(stream, branching_);
-        load_value(stream, trees_);
-        load_value(stream, centers_init_);
-        load_value(stream, leaf_size_);
-        load_value(stream, memoryCounter);
-
         free_elements();
 
         if (root!=NULL) {
@@ -430,6 +424,12 @@ public:
             delete[] indices;
         }
 
+        load_value(stream, branching_);
+        load_value(stream, trees_);
+        load_value(stream, centers_init_);
+        load_value(stream, leaf_size_);
+        load_value(stream, memoryCounter);
+
         indices = new int*[trees_];
         root = new NodePtr[trees_];
         for (int i=0; i<trees_; ++i) {