fixed typo

modules/core/test/test_mat.cpp

@@ -1392,7 +1392,7 @@ TEST(Core_SparseMat, footprint)
 }
 
 
-// Can't fix without duty hacks or broken user code (PR #4159)
+// Can't fix without dirty hacks or broken user code (PR #4159)
 TEST(Core_Mat_vector, DISABLED_OutputArray_create_getMat)
 {
     cv::Mat_<uchar> src_base(5, 1);
@@ -1420,7 +1420,7 @@ TEST(Core_Mat_vector, copyTo_roi_column)
 
     Mat src_full(src_base);
     Mat src(src_full.col(0));
-#if 0 // Can't fix without duty hacks or broken user code (PR #4159)
+#if 0 // Can't fix without dirty hacks or broken user code (PR #4159)
     OutputArray _dst(dst1);
     {
         _dst.create(src.rows, src.cols, src.type());