fix a few linux compilation warnings

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 08cc9e5b51dfad5b85ba1fe97d3b50f8afed2985..5d7203ff3725e8eae1acb7b0980383854f9d27bf 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -634,6 +634,7 @@ FX_BOOL CPDF_Parser::RebuildCrossRef()
     FX_FILESIZE pos = m_Syntax.m_HeaderOffset;
     FX_FILESIZE start_pos, start_pos1;
     FX_FILESIZE last_obj = -1, last_xref = -1, last_trailer = -1;
+    // TODO(tsepez): unused bInUpdate seems suspicious.
     FX_BOOL bInUpdate = FALSE;
     while (pos < m_Syntax.m_FileLen) {
         FX_BOOL bOverFlow = FALSE;
@@ -2152,6 +2153,7 @@ CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjects* pObjList, FX_DWO
     }
     if (word == FX_BSTRC("<<")) {
         FX_FILESIZE saveDictOffset = m_Pos - 2;
+        // TODO(tsepez): unused dwDictSize seems suspicous.
         FX_DWORD dwDictSize = 0;
         if (bTypeOnly) {
             return (CPDF_Object*)PDFOBJ_DICTIONARY;