Code change to avoid signed/unsigned mismatch warnings

core/fpdfapi/fpdf_font/cpdf_cidfont.cpp

 // Copyright 2016 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 "core/fpdfapi/fpdf_font/cpdf_cidfont.h"
 
 #include "core/fpdfapi/fpdf_cmaps/cmap_int.h"
 #include "core/fpdfapi/fpdf_font/font_int.h"
@@ skipping 137 matching lines @@
                                      FX_WCHAR unicode) {
   if (!IsValidEmbeddedCharcodeFromUnicodeCharset(charset))
     return 0;
 
   CPDF_FontGlobals* pFontGlobals =
       CPDF_ModuleMgr::Get()->GetPageModule()->GetFontGlobals();
   const uint16_t* pCodes = pFontGlobals->m_EmbeddedToUnicodes[charset].m_pMap;
   if (!pCodes)
     return 0;
 
-  int nCodes = pFontGlobals->m_EmbeddedToUnicodes[charset].m_Count;
-  for (int i = 0; i < nCodes; ++i) {
+  for (uint32_t i = 0; i < pFontGlobals->m_EmbeddedToUnicodes[charset].m_Count;
+       ++i) {
     if (pCodes[i] == unicode) {
       uint32_t CharCode = FPDFAPI_CharCodeFromCID(pEmbedMap, i);
-      if (CharCode != 0) {
+      if (CharCode != 0)
         return CharCode;
-      }
     }
   }
   return 0;
 }
 
 #endif  // _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
 
 void FT_UseCIDCharmap(FXFT_Face face, int coding) {
   int encoding;
   switch (coding) {
@@ skipping 724 matching lines @@
 
 const uint8_t* CPDF_CIDFont::GetCIDTransform(uint16_t CID) const {
   if (m_Charset != CIDSET_JAPAN1 || m_pFontFile)
     return nullptr;
 
   const struct CIDTransform* found = (const struct CIDTransform*)FXSYS_bsearch(
       &CID, g_Japan1_VertCIDs, FX_ArraySize(g_Japan1_VertCIDs),
       sizeof(g_Japan1_VertCIDs[0]), CompareCIDTransform);
   return found ? &found->a : nullptr;
 }