Fix for-loop which results in no-op

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index 6489b1ed980fd6fbe147226fc78dd54a7b7d6c6d..cc607f447760a5b748c46e7e253d3b1db3c21dd0 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -978,7 +978,7 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
   if (bMainXRef) {
     m_pTrailer = ToDictionary(pStream->GetDict()->Clone());
     ShrinkObjectMap(size);
-    for (auto it : m_ObjectInfo)
+    for (auto& it : m_ObjectInfo)
       it.second.type = 0;
   } else {
     m_Trailers.Add(ToDictionary(pStream->GetDict()->Clone()));