Replace NULL with nullptr in all C++ files.

webrtc/modules/video_capture/linux/video_capture_linux.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 33 matching lines @@
     : VideoCaptureImpl(),
       _captureCritSect(CriticalSectionWrapper::CreateCriticalSection()),
       _deviceId(-1),
       _deviceFd(-1),
       _buffersAllocatedByDevice(-1),
       _currentWidth(-1),
       _currentHeight(-1),
       _currentFrameRate(-1),
       _captureStarted(false),
       _captureVideoType(kVideoI420),
-      _pool(NULL)
-{
-}
+      _pool(nullptr) {}
 
 int32_t VideoCaptureModuleV4L2::Init(const char* deviceUniqueIdUTF8)
 {
     int len = strlen((const char*) deviceUniqueIdUTF8);
     _deviceUniqueId = new (std::nothrow) char[len + 1];
     if (_deviceUniqueId)
     {
         memcpy(_deviceUniqueId, deviceUniqueIdUTF8, len + 1);
     }
 
@@ skipping 282 matching lines @@
         memset(&buffer, 0, sizeof(v4l2_buffer));
         buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
         buffer.memory = V4L2_MEMORY_MMAP;
         buffer.index = i;
 
         if (ioctl(_deviceFd, VIDIOC_QUERYBUF, &buffer) < 0)
         {
             return false;
         }
 
-        _pool[i].start = mmap(NULL, buffer.length, PROT_READ | PROT_WRITE, MAP_SHARED,
-                              _deviceFd, buffer.m.offset);
+        _pool[i].start = mmap(nullptr, buffer.length, PROT_READ | PROT_WRITE,
+                              MAP_SHARED, _deviceFd, buffer.m.offset);
 
         if (MAP_FAILED == _pool[i].start)
         {
             for (unsigned int j = 0; j < i; j++)
                 munmap(_pool[j].start, _pool[j].length);
             return false;
         }
 
         _pool[i].length = buffer.length;
 
@@ skipping 40 matching lines @@
     fd_set rSet;
     struct timeval timeout;
 
     _captureCritSect->Enter();
 
     FD_ZERO(&rSet);
     FD_SET(_deviceFd, &rSet);
     timeout.tv_sec = 1;
     timeout.tv_usec = 0;
 
-    retVal = select(_deviceFd + 1, &rSet, NULL, NULL, &timeout);
+    retVal = select(_deviceFd + 1, &rSet, nullptr, nullptr, &timeout);
     if (retVal < 0 && errno != EINTR) // continue if interrupted
     {
         // select failed
         _captureCritSect->Leave();
         return false;
     }
     else if (retVal == 0)
     {
         // select timed out
         _captureCritSect->Leave();
@@ skipping 47 matching lines @@
 {
     settings.width = _currentWidth;
     settings.height = _currentHeight;
     settings.maxFPS = _currentFrameRate;
     settings.rawType=_captureVideoType;
 
     return 0;
 }
 }  // namespace videocapturemodule
 }  // namespace webrtc