[Test] bugfix in test_set_folding

tests/fpgadataflow/test_set_folding.py

@@ -98,7 +98,8 @@ def make_multi_fclayer_model(ch, wdt, adt, tdt, nnodes):
     model.set_tensor_datatype("outp", adt)
 
     for i in range(1, nnodes + 1):
-        model.graph.value_info.append(tensors[i])
+        if tensors[i].name != "outp":
+            model.graph.value_info.append(tensors[i])
         model.set_initializer("weights_" + str(i - 1), W)
         model.set_initializer("thresh_" + str(i - 1), T)
         model.set_tensor_datatype("weights_" + str(i - 1), wdt)