balanceWhite fixed maxValue bin search

modules/xphoto/src/simple_color_balance.cpp

@@ -123,7 +123,7 @@ void balanceWhiteSimple(std::vector<Mat_<T> > &src, Mat &dst, const float inputM
                 n2 -= hist[p2--];
                 maxValue -= interval;
             }
-            p2 = p2 * bins - 1;
+            p2 = (p2 + 1) * bins - 1;
 
             interval /= bins;
         }