message: fix concat fusion for cuda4dnn
diff: @@ -2972,7 +2972,6 @@ struct Net::Impl : public detail::NetImplBase
  ld.outputBlobsWrappers[0] = wrap(output);
  #endif
  std::vector<Range> chrange(output.dims, Range::all());
  -
  int ofs = 0;
  for( i = 0; i < ninputs; i++ )
  {
  @@ -3000,9 +2999,9 @@ struct Net::Impl : public detail::NetImplBase
  if (preferableBackend == DNN_BACKEND_CUDA)
  {
  auto cuda_wrapper = wrap(output).dynamicCast<CUDABackendWrapper>();
  - auto offset = chrange[1].start * (output.size[2] * output.size[3]);
  - auto shape = MatShape{1, chrange[1].size(), output.size[2], output.size[3]};
  - cuda_wrapper->update(shape, offset);
  + auto offset = chrange[axis].start * output_slice.total(axis + 1, output.dims);
  + auto new_shape = shape(output_slice);
  + cuda_wrapper->update(new_shape, offset);
  inp_i_data->outputBlobsWrappers[pin.oid] = cuda_wrapper.staticCast<BackendWrapper>();
  }
  #endif
  