Code change to avoid signed/unsigned mismatch warnings

core/fpdfapi/fpdf_font/cpdf_cidfont.cpp

Index: core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
diff --git a/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp b/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
index de119b75d1f4c3dde1f7fd5492e716cbeab8fc9f..3329f5c5771de32d027ad2a5cefffe5619bdbc59 100644
--- a/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
+++ b/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
@@ -155,13 +155,12 @@ uint32_t EmbeddedCharcodeFromUnicode(const FXCMAP_CMap* pEmbedMap,
   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;