message: fix LaunchDepthwiseConvBackpropFilterOp
diff: @@ -1763,7 +1763,7 @@ void LaunchDepthwiseConvBackpropFilterOp<GpuDevice, T>::operator()(
  int num_filter_backprop =
  args.filter_rows * args.filter_cols * args.out_depth;
  se::DeviceMemoryBase filter_bp_ptr(filter_backprop, num_filter_backprop);
  - stream->ThenMemset32(&filter_bp_ptr, 0, num_filter_backprop * sizeof(T));
  + stream->ThenMemZero(&filter_bp_ptr, num_filter_backprop * sizeof(T));
  if (args.filter_rows == 3 && args.filter_cols == 3) {
  OP_REQUIRES_OK(
  