#2245 Fix BFMatcher::radiusMatchImpl witch Hamming distance (thanks to Jukka Holappa)

modules/features2d/src/matchers.cpp

@@ -426,10 +426,10 @@ void BFMatcher::radiusMatchImpl( const Mat& queryDescriptors, vector<vector<DMat
 
         for( int qIdx = 0; qIdx < queryDescriptors.rows; qIdx++ )
         {
-            const float* distptr = dist.ptr<float>(qIdx);
+            const float* distptr = distf.ptr<float>(qIdx);
 
             vector<DMatch>& mq = matches[qIdx];
-            for( int k = 0; k < dist.cols; k++ )
+            for( int k = 0; k < distf.cols; k++ )
             {
                 if( distptr[k] <= maxDistance )
                     mq.push_back( DMatch(qIdx, k, iIdx, distptr[k]) );