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 f170b20d9888b31c7f3ac8227b9f114c0bc83298..9d646b2943e140c0f6764b5b61c04e65c861239a 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -973,7 +973,7 @@ 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()));