Get rid of NULLs in xfa/

xfa/fxfa/parser/xfa_document_serialize.cpp

Index: xfa/fxfa/parser/xfa_document_serialize.cpp
diff --git a/xfa/fxfa/parser/xfa_document_serialize.cpp b/xfa/fxfa/parser/xfa_document_serialize.cpp
index d7b8bf04d903033a519f72299c46bdd32e42121d..97058e5568389812eef9f0db9453acb903ebffa4 100644
--- a/xfa/fxfa/parser/xfa_document_serialize.cpp
+++ b/xfa/fxfa/parser/xfa_document_serialize.cpp
@@ -31,7 +31,7 @@ FX_BOOL CXFA_DataImporter::ImportData(IFX_FileRead* pDataDocument) {
     pDataDocumentParser->Release();
     return FALSE;
   }
-  if (pDataDocumentParser->DoParse(NULL) < XFA_PARSESTATUS_Done) {
+  if (pDataDocumentParser->DoParse(nullptr) < XFA_PARSESTATUS_Done) {
     pDataDocumentParser->Release();
     return FALSE;
   }
@@ -477,9 +477,9 @@ FX_BOOL CXFA_DataExporter::Export(IFX_FileWrite* pWrite,
   IFX_Stream* pStream = IFX_Stream::CreateStream(
       pWrite,
       FX_STREAMACCESS_Text | FX_STREAMACCESS_Write | FX_STREAMACCESS_Append);
-  if (pStream == NULL) {
+  if (!pStream)
     return FALSE;
-  }
+
   pStream->SetCodePage(FX_CODEPAGE_UTF8);
   FX_BOOL bRet = Export(pStream, pNode, dwFlag, pChecksum);
   pStream->Release();