fix two uninitialized reads

core/src/fxcodec/codec/fx_codec_jpeg.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fxge/fx_dib.h"
 #include "codec_int.h"
 extern "C" {
@@ skipping 264 matching lines @@
                              FX_LPBYTE* icc_buf_ptr, FX_DWORD* icc_length)
 {
     _JpegScanSOI(src_buf, src_size);
     struct jpeg_decompress_struct cinfo;
     struct jpeg_error_mgr jerr;
     jerr.error_exit = _error_fatal;
     jerr.emit_message = _error_do_nothing1;
     jerr.output_message = _error_do_nothing;
     jerr.format_message = _error_do_nothing2;
     jerr.reset_error_mgr = _error_do_nothing;
+    jerr.trace_level = 0;
     cinfo.err = &jerr;
     jmp_buf mark;
     cinfo.client_data = &mark;
     if (setjmp(mark) == -1) {
         return FALSE;
     }
     jpeg_create_decompress(&cinfo);
     struct jpeg_source_mgr src;
     src.init_source = _src_do_nothing;
     src.term_source = _src_do_nothing;
@@ skipping 431 matching lines @@
         return m_pExtProvider->GetAvailInput(pContext, avail_buf_ptr);
     }
     if(avail_buf_ptr != NULL) {
         *avail_buf_ptr = NULL;
         if(((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer > 0) {
             *avail_buf_ptr = (FX_LPBYTE)((FXJPEG_Context*)pContext)->m_SrcMgr.next_input_byte;
         }
     }
     return (FX_DWORD)((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer;
 }