fix errors in lod_reset_op

paddle/fluid/operators/lod_reset_op.h

@@ -46,8 +46,7 @@ class LoDResetKernel : public framework::OpKernel<T> {
         auto* lod = lod_t->data<int>();
         if (platform::is_gpu_place(ctx.GetPlace())) {
           framework::Tensor lod_cpu;
-          framework::TensorCopy(*lod_t, platform::CPUPlace(),
+          framework::TensorCopySync(*lod_t, platform::CPUPlace(), &lod_cpu);
-                                ctx.device_context(), &lod_cpu);
           lod = lod_cpu.data<int>();
         }
         level0 = std::vector<int>(lod, lod + lod_t->numel());