opencv: Use cv::AutoBuffer<>::data()

modules/core/src/matrix_c.cpp

@@ -169,7 +169,7 @@ Mat cvarrToMat(const CvArr* arr, bool copyData,
         if( abuf )
         {
             abuf->allocate(((size_t)total*esz + sizeof(double)-1)/sizeof(double));
-            double* bufdata = *abuf;
+            double* bufdata = abuf->data();
             cvCvtSeqToArray(seq, bufdata, CV_WHOLE_SEQ);
             return Mat(total, 1, type, bufdata);
         }