Travis: fix check style error.

Author: wanglei828

doc/fluid/design/dist_train/distributed_traing_review.md

@@ -42,7 +42,3 @@ Codistillation is a technique that tries to scale the training further. A few tr
 [3] Yonghui Wu, Mike Schuster, Zhifeng Chen, Quoc V Le, Mohammad Norouzi, Wolfgang Macherey, Maxim Krikun, Yuan Cao, Qin Gao, Klaus Macherey, et al. Google’s neural machine translation system: Bridging the gap between human and machine translation.
 
 [4] LARGE SCALE DISTRIBUTED NEURAL NETWORK TRAINING THROUGH ONLINE DISTILLATION
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paddle/fluid/operators/listen_and_serv_op.cc

@@ -328,9 +328,8 @@ void ListenAndServOp::RunImpl(const framework::Scope &scope,
   rpc_service_->WaitServerReady();
 
   // Write to a file of server selected port for python use.
-  std::string file_path =
-    string::Sprintf("/tmp/paddle.%d.selected_port",
-                    static_cast<int>(::getpid()));
+  std::string file_path = string::Sprintf("/tmp/paddle.%d.selected_port",
+                                          static_cast<int>(::getpid()));
   SavePort(file_path);
   if (sync_mode) {
     RunSyncLoop(&executor, program, &recv_scope, prefetch_block);