small brief edit, was trying to allow user to pass integral image but this…

small brief edit, was trying to allow user to pass integral image but this introduced some bugs, so no longer doing this...
for now.

modules/features2d/src/brief.cpp

@@ -70,10 +70,13 @@ void BriefDescriptorExtractor::compute(const Mat& image, std::vector<KeyPoint>&
 {
   // Construct integral image for fast smoothing (box filter)
   Mat sum;
-  if(image.type() == CV_32S)
-    sum = image;
-  else
-    integral(image, sum, CV_32S);
+  
+  ///TODO allow the user to pass in a precomputed integral image
+  //if(image.type() == CV_32S)
+  //  sum = image;
+  //else
+  
+  integral(image, sum, CV_32S);
 
   //Remove keypoints very close to the border
   removeBorderKeypoints(keypoints, image.size(), PATCH_SIZE/2 + KERNEL_SIZE/2);