Clean up XFA code which causes warnings

xfa/fxfa/parser/xfa_basic_imp.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 "xfa/fxfa/parser/xfa_basic_imp.h"
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fgas/crt/fgas_algorithm.h"
@@ skipping 470 matching lines @@
     case XFA_UNIT_Mp:
       fValue /= 0.001f;
       return TRUE;
     case XFA_UNIT_Pc:
       fValue /= 12.0f;
       return TRUE;
     default:
       fValue = 0;
       return FALSE;
   }
-  return FALSE;
 }
 XFA_UNIT CXFA_Measurement::GetUnit(const CFX_WideStringC& wsUnit) {
   if (wsUnit == FX_WSTRC(L"mm")) {
     return XFA_UNIT_Mm;
   } else if (wsUnit == FX_WSTRC(L"pt")) {
     return XFA_UNIT_Pt;
   } else if (wsUnit == FX_WSTRC(L"in")) {
     return XFA_UNIT_In;
   } else if (wsUnit == FX_WSTRC(L"cm")) {
     return XFA_UNIT_Cm;
@@ skipping 66 matching lines @@
   m_iPosition += iMaxLength;
   bEOS = IsEOF();
   return iMaxLength;
 }
 uint16_t CXFA_WideTextRead::GetCodePage() const {
   return (sizeof(FX_WCHAR) == 2) ? FX_CODEPAGE_UTF16LE : FX_CODEPAGE_UTF32LE;
 }
 uint16_t CXFA_WideTextRead::SetCodePage(uint16_t wCodePage) {
   return GetCodePage();
 }