clean code

paddle/operators/rnn/recurrent_op_utils.cc

@@ -112,14 +112,11 @@ void InitArgument(const ArgumentName& name, Argument* arg,
                   const framework::OperatorBase& op, bool is_grad) {
   arg->step_scopes =
       is_grad ? op.Input(name.step_scopes) : op.Output(name.step_scopes);
-
   arg->inlinks = op.Inputs(name.inlinks);
-
   arg->outlinks = op.Outputs(name.outlinks);
 
   auto boot_memories =
       is_grad ? op.Outputs(name.boot_memories) : op.Inputs(name.boot_memories);
-
   // attributes
   auto memories = op.Attr<std::vector<std::string>>(name.memories);
   auto pre_memories = op.Attr<std::vector<std::string>>(name.pre_memories);