Fix zero-copy mode tests

tests/test_low_latency.py

@@ -78,7 +78,7 @@ def test_main(num_tokens: int, hidden: int, num_experts: int, num_topk: int,
                     buffer.get_next_low_latency_combine_buffer(handle)[:, :, :] = simulated_gemm_x
                 out = torch.empty((num_tokens, hidden), dtype=torch.bfloat16, device='cuda')
                 combined_x, event, hook = buffer.low_latency_combine(simulated_gemm_x, topk_idx, topk_weights, handle,
-                                                                     async_finish=not return_recv_hook,
+                                                                     async_finish=not return_recv_hook, zero_copy=zero_copy,
                                                                      return_recv_hook=return_recv_hook, out=out)
                 hook() if return_recv_hook else event.current_stream_wait()
                 if do_check: