fixed the difference of the calculation result for findStereoCorrespondenceBM_SSE2() and findStereoCorrespondenceBM_().
fixed the difference of the calculation result for findStereoCorrespondenceBM_SSE2() and findStereoCorrespondenceBM_().

opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv