Get rid of NULLs in core/

core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp

Index: core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
diff --git a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 994c1c8a5a38fde1e4c95f3c9ac40b40576d3085..46cd28c8add32bfb1efcf615f1e7c60f6805c469 100644
--- a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -899,7 +899,7 @@ CPDF_Creator::~CPDF_Creator() {
   ResetStandardSecurity();
   if (m_bEncryptCloned && m_pEncryptDict) {
     m_pEncryptDict->Release();
-    m_pEncryptDict = NULL;
+    m_pEncryptDict = nullptr;
   }
   Clear();
 }
@@ -1441,7 +1441,7 @@ int32_t CPDF_Creator::WriteDoc_Stage1(IFX_Pause* pPause) {
       m_dwFlags &= ~FPDFCREATE_INCREMENTAL;
     }
     CPDF_Dictionary* pDict = m_pDocument->GetRoot();
-    m_pMetadata = pDict ? pDict->GetDirectObjectBy("Metadata") : NULL;
+    m_pMetadata = pDict ? pDict->GetDirectObjectBy("Metadata") : nullptr;
     if (m_dwFlags & FPDFCREATE_OBJECTSTREAM) {
       m_pXRefStream.reset(new CPDF_XRefStream);
       m_pXRefStream->Start();
@@ -1556,7 +1556,7 @@ int32_t CPDF_Creator::WriteDoc_Stage2(IFX_Pause* pPause) {
     m_iStage = 27;
   }
   if (m_iStage == 27) {
-    if (NULL != m_pEncryptDict && 0 == m_pEncryptDict->GetObjNum()) {
+    if (m_pEncryptDict && 0 == m_pEncryptDict->GetObjNum()) {
       m_dwLastObjNum += 1;
       FX_FILESIZE saveOffset = m_Offset;
       if (WriteIndirectObj(m_dwLastObjNum, m_pEncryptDict) < 0) {
@@ -1899,7 +1899,7 @@ void CPDF_Creator::Clear() {
   m_NewObjNumArray.RemoveAll();
   if (m_pIDArray) {
     m_pIDArray->Release();
-    m_pIDArray = NULL;
+    m_pIDArray = nullptr;
   }
 }
 
@@ -1919,14 +1919,14 @@ bool CPDF_Creator::Create(uint32_t flags) {
   if (flags & FPDFCREATE_PROGRESSIVE) {
     return true;
   }
-  return Continue(NULL) > -1;
+  return Continue(nullptr) > -1;
 }
 void CPDF_Creator::InitID(FX_BOOL bDefault) {
-  CPDF_Array* pOldIDArray = m_pParser ? m_pParser->GetIDArray() : NULL;
+  CPDF_Array* pOldIDArray = m_pParser ? m_pParser->GetIDArray() : nullptr;
   FX_BOOL bNewId = !m_pIDArray;
   if (!m_pIDArray) {
     m_pIDArray = new CPDF_Array;
-    CPDF_Object* pID1 = pOldIDArray ? pOldIDArray->GetObjectAt(0) : NULL;
+    CPDF_Object* pID1 = pOldIDArray ? pOldIDArray->GetObjectAt(0) : nullptr;
     if (pID1) {
       m_pIDArray->Add(pID1->Clone());
     } else {