Re-enable several MSVC warnings

fpdfsdk/formfiller/FFL_CBA_Fontmap.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/include/formfiller/FFL_CBA_Fontmap.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_simple_parser.h"
@@ skipping 187 matching lines @@
 
 CPDF_Font* CBA_FontMap::GetAnnotDefaultFont(CFX_ByteString& sAlias) {
   CPDF_Dictionary* pAcroFormDict = NULL;
   const bool bWidget = (m_pAnnotDict->GetStringBy("Subtype") == "Widget");
   if (bWidget) {
     if (CPDF_Dictionary* pRootDict = m_pDocument->GetRoot())
       pAcroFormDict = pRootDict->GetDictBy("AcroForm");
   }
 
   CFX_ByteString sDA;
-  CPDF_Object* pObj;
-  if ((pObj = FPDF_GetFieldAttr(m_pAnnotDict, "DA")))
+  CPDF_Object* pObj = FPDF_GetFieldAttr(m_pAnnotDict, "DA");
+  if (pObj)
     sDA = pObj->GetString();
 
   if (bWidget) {
     if (sDA.IsEmpty()) {
       pObj = FPDF_GetFieldAttr(pAcroFormDict, "DA");
       sDA = pObj ? pObj->GetString() : CFX_ByteString();
     }
   }
 
   CPDF_Dictionary* pFontDict = NULL;
@@ skipping 30 matching lines @@
 
   return pFontDict ? m_pDocument->LoadFont(pFontDict) : nullptr;
 }
 
 void CBA_FontMap::SetAPType(const CFX_ByteString& sAPType) {
   m_sAPType = sAPType;
 
   Reset();
   Initialize();
 }