Replace NULL with nullptr in all C++ files.

webrtc/voice_engine/test/cmd_test/voe_cmd_test.cc

Index: webrtc/voice_engine/test/cmd_test/voe_cmd_test.cc
diff --git a/webrtc/voice_engine/test/cmd_test/voe_cmd_test.cc b/webrtc/voice_engine/test/cmd_test/voe_cmd_test.cc
index 0b5af8db935c4a11ff6328bf4a2d4bc28486dcd1..494f13f0a0ab6a7e61c12146942b93d8e7dac8f2 100644
--- a/webrtc/voice_engine/test/cmd_test/voe_cmd_test.cc
+++ b/webrtc/voice_engine/test/cmd_test/voe_cmd_test.cc
@@ -51,18 +51,18 @@ using namespace test;
     printf("*** Error code = %i \n", base1->LastError());  \
   }
 
-VoiceEngine* m_voe = NULL;
-VoEBase* base1 = NULL;
-VoECodec* codec = NULL;
-VoEVolumeControl* volume = NULL;
-VoERTP_RTCP* rtp_rtcp = NULL;
-VoEAudioProcessing* apm = NULL;
-VoENetwork* netw = NULL;
-VoEFile* file = NULL;
-VoEVideoSync* vsync = NULL;
-VoEHardware* hardware = NULL;
-VoEExternalMedia* xmedia = NULL;
-VoENetEqStats* neteqst = NULL;
+VoiceEngine* m_voe = nullptr;
+VoEBase* base1 = nullptr;
+VoECodec* codec = nullptr;
+VoEVolumeControl* volume = nullptr;
+VoERTP_RTCP* rtp_rtcp = nullptr;
+VoEAudioProcessing* apm = nullptr;
+VoENetwork* netw = nullptr;
+VoEFile* file = nullptr;
+VoEVideoSync* vsync = nullptr;
+VoEHardware* hardware = nullptr;
+VoEExternalMedia* xmedia = nullptr;
+VoENetEqStats* neteqst = nullptr;
 
 void RunTest(std::string out_path);
 
@@ -146,7 +146,7 @@ int main(int argc, char** argv) {
     VoiceEngine::SetTraceFilter(kTraceAll);
     res = VoiceEngine::SetTraceFile(trace_filename.c_str());
     VALIDATE;
-    res = VoiceEngine::SetTraceCallback(NULL);
+    res = VoiceEngine::SetTraceCallback(nullptr);
     VALIDATE;
     printf("Outputting logs to file: %s\n", trace_filename.c_str());
   }
@@ -155,7 +155,7 @@ int main(int argc, char** argv) {
   res = base1->Init();
   if (res != 0) {
     printf("\nError calling Init: %d\n", base1->LastError());
-    fflush(NULL);
+    fflush(nullptr);
     exit(1);
   }
 
@@ -238,7 +238,7 @@ void RunTest(std::string out_path) {
   chan = base1->CreateChannel();
   if (chan < 0) {
     printf("************ Error code = %i\n", base1->LastError());
-    fflush(NULL);
+    fflush(nullptr);
   }
 
   VoiceChannelTransport* voice_channel_transport(
@@ -790,7 +790,7 @@ void RunTest(std::string out_path) {
   delete voice_channel_transport;
   for (int i = 0; i < kMaxNumChannels; ++i) {
     delete voice_channel_transports[i];
-    voice_channel_transports[i] = NULL;
+    voice_channel_transports[i] = nullptr;
   }
 
   printf("Delete channels \n");