Coverity: Fix missing return in error check in remoting::X11Client::DoInitX11.

remoting/client/x11_client.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file implements a X11 chromoting client.
 
 #include <iostream>
 
 #include "base/at_exit.h"
 #include "base/message_loop.h"
@@ skipping 79 matching lines @@
   void InitX11() {
     message_loop_->PostTask(FROM_HERE,
                          NewRunnableMethod(this, &X11Client::DoInitX11));
   }
 
   void DoInitX11() {
     display_ = XOpenDisplay(NULL);
     if (!display_) {
       std::cout << "Error - cannot open display" << std::endl;
       client_done_->Signal();
+      return;
     }
 
     // Get properties of the screen.
     int screen = DefaultScreen(display_);
     int root_window = RootWindow(display_, screen);
 
     // Creates the window.
     window_ = XCreateSimpleWindow(display_, root_window, 1, 1, 640, 480, 0,
                                   BlackPixel(display_, screen),
                                   BlackPixel(display_, screen));
@@ skipping 141 matching lines @@
 
   client->DestroyX11();
 
   // Quit the current message loop.
   network_thread.message_loop()->PostTask(FROM_HERE,
                                           new MessageLoop::QuitTask());
   network_thread.Stop();
 
   return 0;
 }