message: dnn: Remove a duplicated code snippet for flatten layer
diff: @@ -83,12 +83,6 @@ public:
  int startAxis = clamp(_startAxis, numAxes);
  int endAxis = clamp(_endAxis, numAxes);
  - for (size_t i = 1; i < inputs.size(); i++)
  - {
  - CV_Assert(inputs[i] == inputs[0]);
  - }
  -
  -
  CV_Assert(startAxis >= 0);
  CV_Assert(endAxis >= startAxis && endAxis < (int)numAxes);
  