scripted-diff: Use the C++11 keyword nullptr to denote the pointer literal instead of the macro NULL

-BEGIN VERIFY SCRIPT-
sed -i 's/\<NULL\>/nullptr/g' src/*.cpp src/*.h src/*/*.cpp src/*/*.h src/qt/*/*.cpp src/qt/*/*.h src/wallet/*/*.cpp src/wallet/*/*.h src/support/allocators/*.h
sed -i 's/Prefer nullptr, otherwise SAFECOOKIE./Prefer NULL, otherwise SAFECOOKIE./g' src/torcontrol.cpp
sed -i 's/tor: Using nullptr authentication/tor: Using NULL authentication/g' src/torcontrol.cpp
sed -i 's/METHODS=nullptr/METHODS=NULL/g' src/test/torcontrol_tests.cpp src/torcontrol.cpp
sed -i 's/nullptr certificates/NULL certificates/g' src/qt/paymentserver.cpp
sed -i 's/"nullptr"/"NULL"/g' src/torcontrol.cpp src/test/torcontrol_tests.cpp
-END VERIFY SCRIPT-

src/util.cpp

@@ -144,7 +144,7 @@ public:
         // Securely erase the memory used by the PRNG
         RAND_cleanup();
         // Shutdown OpenSSL library multithreading support
-        CRYPTO_set_locking_callback(NULL);
+        CRYPTO_set_locking_callback(nullptr);
         // Clear the set of locks now to maintain symmetry with the constructor.
         ppmutexOpenSSL.reset();
     }
@@ -173,8 +173,8 @@ static boost::once_flag debugPrintInitFlag = BOOST_ONCE_INIT;
  * the OS/libc. When the shutdown sequence is fully audited and
  * tested, explicit destruction of these objects can be implemented.
  */
-static FILE* fileout = NULL;
-static boost::mutex* mutexDebugLog = NULL;
+static FILE* fileout = nullptr;
+static boost::mutex* mutexDebugLog = nullptr;
 static std::list<std::string>* vMsgsBeforeOpenLog;
 
 static int FileWriteStr(const std::string &str, FILE *fp)
@@ -184,7 +184,7 @@ static int FileWriteStr(const std::string &str, FILE *fp)
 
 static void DebugPrintInit()
 {
-    assert(mutexDebugLog == NULL);
+    assert(mutexDebugLog == nullptr);
     mutexDebugLog = new boost::mutex();
     vMsgsBeforeOpenLog = new std::list<std::string>;
 }
@@ -194,12 +194,12 @@ void OpenDebugLog()
     boost::call_once(&DebugPrintInit, debugPrintInitFlag);
     boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
 
-    assert(fileout == NULL);
+    assert(fileout == nullptr);
     assert(vMsgsBeforeOpenLog);
     fs::path pathDebug = GetDataDir() / "debug.log";
     fileout = fsbridge::fopen(pathDebug, "a");
     if (fileout) {
-        setbuf(fileout, NULL); // unbuffered
+        setbuf(fileout, nullptr); // unbuffered
         // dump buffered messages from before we opened the log
         while (!vMsgsBeforeOpenLog->empty()) {
             FileWriteStr(vMsgsBeforeOpenLog->front(), fileout);
@@ -208,7 +208,7 @@ void OpenDebugLog()
     }
 
     delete vMsgsBeforeOpenLog;
-    vMsgsBeforeOpenLog = NULL;
+    vMsgsBeforeOpenLog = nullptr;
 }
 
 struct CLogCategoryDesc
@@ -344,7 +344,7 @@ int LogPrintStr(const std::string &str)
         boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
 
         // buffer if we haven't opened the log yet
-        if (fileout == NULL) {
+        if (fileout == nullptr) {
             assert(vMsgsBeforeOpenLog);
             ret = strTimestamped.length();
             vMsgsBeforeOpenLog->push_back(strTimestamped);
@@ -355,8 +355,8 @@ int LogPrintStr(const std::string &str)
             if (fReopenDebugLog) {
                 fReopenDebugLog = false;
                 fs::path pathDebug = GetDataDir() / "debug.log";
-                if (fsbridge::freopen(pathDebug,"a",fileout) != NULL)
-                    setbuf(fileout, NULL); // unbuffered
+                if (fsbridge::freopen(pathDebug,"a",fileout) != nullptr)
+                    setbuf(fileout, nullptr); // unbuffered
             }
 
             ret = FileWriteStr(strTimestamped, fileout);
@@ -503,7 +503,7 @@ static std::string FormatException(const std::exception* pex, const char* pszThr
 {
 #ifdef WIN32
     char pszModule[MAX_PATH] = "";
-    GetModuleFileNameA(NULL, pszModule, sizeof(pszModule));
+    GetModuleFileNameA(nullptr, pszModule, sizeof(pszModule));
 #else
     const char* pszModule = "bitcoin";
 #endif
@@ -534,7 +534,7 @@ fs::path GetDefaultDataDir()
 #else
     fs::path pathRet;
     char* pszHome = getenv("HOME");
-    if (pszHome == NULL || strlen(pszHome) == 0)
+    if (pszHome == nullptr || strlen(pszHome) == 0)
         pathRet = fs::path("/");
     else
         pathRet = fs::path(pszHome);
@@ -791,7 +791,7 @@ void ShrinkDebugFile()
             fclose(file);
         }
     }
-    else if (file != NULL)
+    else if (file != nullptr)
         fclose(file);
 }
 
@@ -800,7 +800,7 @@ fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 {
     char pszPath[MAX_PATH] = "";
 
-    if(SHGetSpecialFolderPathA(NULL, pszPath, nFolder, fCreate))
+    if(SHGetSpecialFolderPathA(nullptr, pszPath, nFolder, fCreate))
     {
         return fs::path(pszPath);
     }