Fix a small leak in CPDF_DataAvail::CheckTrailer().

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 23efb5259624e70636000375745ef9f8df947663..21b2fbae8a99e7d0436da086eae83b784e9c1cdb 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -4104,6 +4104,7 @@ FX_BOOL CPDF_DataAvail::CheckTrailerAppend(IFX_DownloadHints* pHints) {
   }
   return TRUE;
 }
+
 FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints) {
   int32_t iTrailerSize =
       (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
@@ -4121,13 +4122,14 @@ FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints) {
     CFX_SmartPointer<IFX_FileStream> file(
         FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
     m_syntaxParser.InitParser(file.Get(), 0);
-    CPDF_Object* pTrailer = m_syntaxParser.GetObject(NULL, 0, 0, 0);
+    CPDF_Object* pTrailer = m_syntaxParser.GetObject(nullptr, 0, 0);
     if (!pTrailer) {
       m_Pos += m_syntaxParser.SavePos();
       pHints->AddSegment(m_Pos, iTrailerSize);
       return FALSE;
     }
     if (pTrailer->GetType() != PDFOBJ_DICTIONARY) {
+      pTrailer->Release();
       return FALSE;
     }
     CPDF_Dictionary* pTrailerDict = pTrailer->GetDict();
@@ -4165,6 +4167,7 @@ FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints) {
   pHints->AddSegment(m_Pos, iTrailerSize);
   return FALSE;
 }
+
 FX_BOOL CPDF_DataAvail::CheckPage(int32_t iPage, IFX_DownloadHints* pHints) {
   while (TRUE) {
     switch (m_docStatus) {