message: avoid negative index.
diff: @@ -44,7 +44,7 @@ static const char* getTestOpMath(unsigned testOp)
  const char* depthToString_(int depth)
  {
  static const char* depthNames[] = { "CV_8U", "CV_8S", "CV_16U", "CV_16S", "CV_32S", "CV_32F", "CV_64F", "CV_USRTYPE1" };
  - return depth <= CV_USRTYPE1 ? depthNames[depth] : NULL;
  + return (depth <= CV_USRTYPE1 && depth >= 0) ? depthNames[depth] : NULL;
  }
  const cv::String typeToString_(int type)
  