Fix a leak in PDF_DataDecode() on failure.

core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
index 402a19ed4a9b1b5738cec29729eee0d40fcd8a84..2d6e9f3436561e59d98aad8c0a708ef0339952c2 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -416,6 +416,7 @@ FX_BOOL PDF_DataDecode(const uint8_t* src_buf,
       FX_Free(last_buf);
     }
     if (offset == -1) {
+      FX_Free(new_buf);
       return FALSE;
     }
     last_buf = new_buf;