fix --saved_model option

Author: guschmue

tf2onnx/convert.py

@@ -107,7 +107,7 @@ def main():
         model_path = args.saved_model
 
     # todo: consider to enable const folding by default?
-    graph_def = tf_optimize(args.inputs, args.outputs, graph_def, args.fold_const)
+    graph_def = tf_optimize(inputs, outputs, graph_def, args.fold_const)
 
     with tf.Graph().as_default() as tf_graph:
         tf.import_graph_def(graph_def, name='')