Fix nx crash.

remoting/host/event_executor_linux.cc

 // Copyright (c) 2012 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.
 
 #include "remoting/host/event_executor.h"
 
 #include <X11/Xlib.h>
 #include <X11/extensions/XTest.h>
 #include <X11/extensions/XInput.h>
 
@@ skipping 284 matching lines @@
     XDeviceInfo* device_info = &devices[i];
     if (device_info->use == IsXExtensionPointer &&
         strcmp(device_info->name, "Virtual core XTEST pointer") == 0) {
       device_id = device_info->id;
       device_found = true;
       break;
     }
   }
   XFreeDeviceList(devices);
 
-  if (!device_found)
-    LOG(ERROR) << "Cannot find XTest device.";
+  if (!device_found) {
+    LOG(INFO) << "Cannot find XTest device.";
+    return;
+  }
 
   XDevice* device = XOpenDevice(display_, device_id);
-  if (!device)
+  if (!device) {
     LOG(ERROR) << "Cannot open XTest device.";
+    return;
+  }
 
   int num_device_buttons = XGetDeviceButtonMapping(display_, device, NULL, 0);
   scoped_array<unsigned char> button_mapping(new unsigned char[num_buttons]);
   for (int i = 0; i < num_device_buttons; i++) {
     button_mapping[i] = i + 1;
   }
   error = XSetDeviceButtonMapping(display_, device, button_mapping.get(),
                                   num_device_buttons);
   if (error != Success)
     LOG(ERROR) << "Failed to set XTest device button mapping: " << error;
@@ skipping 54 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
   scoped_ptr<EventExecutorLinux> executor(
       new EventExecutorLinux(main_task_runner));
   if (!executor->Init())
     return scoped_ptr<EventExecutor>(NULL);
   return executor.PassAs<EventExecutor>();
 }
 
 }  // namespace remoting