Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_processing/aecm/echo_control_mobile.cc

Index: webrtc/modules/audio_processing/aecm/echo_control_mobile.cc
diff --git a/webrtc/modules/audio_processing/aecm/echo_control_mobile.cc b/webrtc/modules/audio_processing/aecm/echo_control_mobile.cc
index a81466e678e681901221a8a181b6f47bb7e3b935..7cc3bc4a35cb71fbdff61a38e0bfed8a01ff1be5 100644
--- a/webrtc/modules/audio_processing/aecm/echo_control_mobile.cc
+++ b/webrtc/modules/audio_processing/aecm/echo_control_mobile.cc
@@ -88,7 +88,7 @@ void* WebRtcAecm_Create() {
     aecm->aecmCore = WebRtcAecm_CreateCore();
     if (!aecm->aecmCore) {
         WebRtcAecm_Free(aecm);
-        return NULL;
+        return nullptr;
     }
 
     aecm->farendBuf = WebRtc_CreateBuffer(kBufSizeSamp,
@@ -96,7 +96,7 @@ void* WebRtcAecm_Create() {
     if (!aecm->farendBuf)
     {
         WebRtcAecm_Free(aecm);
-        return NULL;
+        return nullptr;
     }
 
     aecm->initFlag = 0;
@@ -118,8 +118,8 @@ void* WebRtcAecm_Create() {
 void WebRtcAecm_Free(void* aecmInst) {
   AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
 
-    if (aecm == NULL) {
-      return;
+  if (aecm == nullptr) {
+    return;
     }
 
 #ifdef AEC_DEBUG
@@ -143,9 +143,8 @@ int32_t WebRtcAecm_Init(void *aecmInst, int32_t sampFreq)
     AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
     AecmConfig aecConfig;
 
-    if (aecm == NULL)
-    {
-        return -1;
+    if (aecm == nullptr) {
+      return -1;
     }
 
     if (sampFreq != 8000 && sampFreq != 16000)
@@ -200,10 +199,10 @@ int32_t WebRtcAecm_GetBufferFarendError(void *aecmInst, const int16_t *farend,
                                 size_t nrOfSamples) {
   AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
 
-  if (aecm == NULL)
+  if (aecm == nullptr)
     return -1;
 
-  if (farend == NULL)
+  if (farend == nullptr)
     return AECM_NULL_POINTER_ERROR;
 
   if (aecm->initFlag != kInitCheck)
@@ -251,19 +250,16 @@ int32_t WebRtcAecm_Process(void *aecmInst, const int16_t *nearendNoisy,
     short msInAECBuf;
 #endif
 
-    if (aecm == NULL)
-    {
-        return -1;
+    if (aecm == nullptr) {
+      return -1;
     }
 
-    if (nearendNoisy == NULL)
-    {
-        return AECM_NULL_POINTER_ERROR;
+    if (nearendNoisy == nullptr) {
+      return AECM_NULL_POINTER_ERROR;
     }
 
-    if (out == NULL)
-    {
-        return AECM_NULL_POINTER_ERROR;
+    if (out == nullptr) {
+      return AECM_NULL_POINTER_ERROR;
     }
 
     if (aecm->initFlag != kInitCheck)
@@ -293,12 +289,10 @@ int32_t WebRtcAecm_Process(void *aecmInst, const int16_t *nearendNoisy,
 
     if (aecm->ECstartup)
     {
-        if (nearendClean == NULL)
-        {
-            if (out != nearendNoisy)
-            {
-                memcpy(out, nearendNoisy, sizeof(short) * nrOfSamples);
-            }
+      if (nearendClean == nullptr) {
+        if (out != nearendNoisy) {
+          memcpy(out, nearendNoisy, sizeof(short) * nrOfSamples);
+        }
         } else if (out != nearendClean)
         {
             memcpy(out, nearendClean, sizeof(short) * nrOfSamples);
@@ -382,7 +376,7 @@ int32_t WebRtcAecm_Process(void *aecmInst, const int16_t *nearendNoisy,
         for (i = 0; i < nFrames; i++)
         {
             int16_t farend[FRAME_LEN];
-            const int16_t* farend_ptr = NULL;
+            const int16_t* farend_ptr = nullptr;
 
             nmbrOfFilledBuffers =
                 (short) WebRtc_available_read(aecm->farendBuf) / FRAME_LEN;
@@ -414,14 +408,11 @@ int32_t WebRtcAecm_Process(void *aecmInst, const int16_t *nearendNoisy,
             // Call the AECM
             /*WebRtcAecm_ProcessFrame(aecm->aecmCore, farend, &nearend[FRAME_LEN * i],
              &out[FRAME_LEN * i], aecm->knownDelay);*/
-            if (WebRtcAecm_ProcessFrame(aecm->aecmCore,
-                                        farend_ptr,
-                                        &nearendNoisy[FRAME_LEN * i],
-                                        (nearendClean
-                                         ? &nearendClean[FRAME_LEN * i]
-                                         : NULL),
-                                        &out[FRAME_LEN * i]) == -1)
-                return -1;
+            if (WebRtcAecm_ProcessFrame(
+                    aecm->aecmCore, farend_ptr, &nearendNoisy[FRAME_LEN * i],
+                    (nearendClean ? &nearendClean[FRAME_LEN * i] : nullptr),
+                    &out[FRAME_LEN * i]) == -1)
+              return -1;
         }
     }
 
@@ -439,9 +430,8 @@ int32_t WebRtcAecm_set_config(void *aecmInst, AecmConfig config)
 {
     AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
 
-    if (aecm == NULL)
-    {
-        return -1;
+    if (aecm == nullptr) {
+      return -1;
     }
 
     if (aecm->initFlag != kInitCheck)
@@ -521,10 +511,10 @@ int32_t WebRtcAecm_InitEchoPath(void* aecmInst,
     AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
     const int16_t* echo_path_ptr = static_cast<const int16_t*>(echo_path);
 
-    if (aecmInst == NULL) {
+    if (aecmInst == nullptr) {
       return -1;
     }
-    if (echo_path == NULL) {
+    if (echo_path == nullptr) {
       return AECM_NULL_POINTER_ERROR;
     }
     if (size_bytes != WebRtcAecm_echo_path_size_bytes())
@@ -549,10 +539,10 @@ int32_t WebRtcAecm_GetEchoPath(void* aecmInst,
     AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
     int16_t* echo_path_ptr = static_cast<int16_t*>(echo_path);
 
-    if (aecmInst == NULL) {
+    if (aecmInst == nullptr) {
       return -1;
     }
-    if (echo_path == NULL) {
+    if (echo_path == nullptr) {
       return AECM_NULL_POINTER_ERROR;
     }
     if (size_bytes != WebRtcAecm_echo_path_size_bytes())