Get rid of NULLs in core/

core/fpdfapi/fpdf_parser/cpdf_array.cpp

Index: core/fpdfapi/fpdf_parser/cpdf_array.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_array.cpp b/core/fpdfapi/fpdf_parser/cpdf_array.cpp
index 20073772b71176c547039470e0a464ec6ecc0c2e..a047b3af7ba20cc4984179acdaaaec29807b6d9b 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_array.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_array.cpp
@@ -101,12 +101,12 @@ FX_FLOAT CPDF_Array::GetNumberAt(size_t i) const {
 CPDF_Dictionary* CPDF_Array::GetDictAt(size_t i) const {
   CPDF_Object* p = GetDirectObjectAt(i);
   if (!p)
-    return NULL;
+    return nullptr;
   if (CPDF_Dictionary* pDict = p->AsDictionary())
     return pDict;
   if (CPDF_Stream* pStream = p->AsStream())
     return pStream->GetDict();
-  return NULL;
+  return nullptr;
 }
 
 CPDF_Stream* CPDF_Array::GetStreamAt(size_t i) const {