Get rid of most instance of 'foo == NULL'

core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index 7858eae057d53cce61bd342eb4477fa1e556e4e9..c75361b5fa6d08ac47523cf03cf3ff5d9696d3b0 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -583,7 +583,7 @@ FX_POSITION CPDF_Dictionary::GetStartPos() const {
 }
 CPDF_Object* CPDF_Dictionary::GetNextElement(FX_POSITION& pos,
                                              CFX_ByteString& key) const {
-  if (pos == NULL) {
+  if (!pos) {
     return NULL;
   }
   CPDF_Object* p;
@@ -737,7 +737,7 @@ void CPDF_Dictionary::RemoveAt(const CFX_ByteStringC& key) {
   ASSERT(m_Type == PDFOBJ_DICTIONARY);
   CPDF_Object* p = NULL;
   m_Map.Lookup(key, (void*&)p);
-  if (p == NULL) {
+  if (!p) {
     return;
   }
   p->Release();
@@ -748,14 +748,14 @@ void CPDF_Dictionary::ReplaceKey(const CFX_ByteStringC& oldkey,
   ASSERT(m_Type == PDFOBJ_DICTIONARY);
   CPDF_Object* p = NULL;
   m_Map.Lookup(oldkey, (void*&)p);
-  if (p == NULL) {
+  if (!p) {
     return;
   }
   m_Map.RemoveKey(oldkey);
   m_Map.SetAt(newkey, p);
 }
 FX_BOOL CPDF_Dictionary::Identical(CPDF_Dictionary* pOther) const {
-  if (pOther == NULL) {
+  if (!pOther) {
     return FALSE;
   }
   if (m_Map.GetCount() != pOther->m_Map.GetCount()) {
@@ -1156,7 +1156,7 @@ void CPDF_IndirectObjects::ReleaseIndirectObject(FX_DWORD objnum) {
 }
 void CPDF_IndirectObjects::InsertIndirectObject(FX_DWORD objnum,
                                                 CPDF_Object* pObj) {
-  if (objnum == 0 || pObj == NULL) {
+  if (objnum == 0 || !pObj) {
     return;
   }
   void* value = NULL;