Style Change: NULL->nullptr

src/ports/SkTLS_pthread.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTLS.h"
 
 #include <pthread.h>
 
 static pthread_key_t gSkTLSKey;
 static pthread_once_t gSkTLSKey_Once = PTHREAD_ONCE_INIT;
 
 static void sk_tls_make_key() {
     (void)pthread_key_create(&gSkTLSKey, SkTLS::Destructor);
 }
 
 void* SkTLS::PlatformGetSpecific(bool forceCreateTheSlot) {
     // should we use forceCreateTheSlot to potentially skip calling pthread_once
-    // and just return NULL if we've never been called with
+    // and just return nullptr if we've never been called with
     // forceCreateTheSlot==true ?
 
     (void)pthread_once(&gSkTLSKey_Once, sk_tls_make_key);
     return pthread_getspecific(gSkTLSKey);
 }
 
 void SkTLS::PlatformSetSpecific(void* ptr) {
     (void)pthread_setspecific(gSkTLSKey, ptr);
 }