Get rid of NULLs in core/

core/fxcodec/codec/fx_codec_fax.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 "core/fxcodec/codec/codec_int.h"
 #include "core/fxcodec/include/fx_codec.h"
 
 namespace {
@@ skipping 519 matching lines @@
 
 FX_BOOL CCodec_FaxDecoder::v_Rewind() {
   FXSYS_memset(m_pRefBuf, 0xff, m_Pitch);
   bitpos = 0;
   return TRUE;
 }
 uint8_t* CCodec_FaxDecoder::v_GetNextLine() {
   int bitsize = m_SrcSize * 8;
   FaxSkipEOL(m_pSrcBuf, bitsize, bitpos);
   if (bitpos >= bitsize) {
-    return NULL;
+    return nullptr;
   }
   FXSYS_memset(m_pScanlineBuf, 0xff, m_Pitch);
   if (m_Encoding < 0) {
     FaxG4GetRow(m_pSrcBuf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf,
                 m_OrigWidth);
     FXSYS_memcpy(m_pRefBuf, m_pScanlineBuf, m_Pitch);
   } else if (m_Encoding == 0) {
     FaxGet1DLine(m_pSrcBuf, bitsize, bitpos, m_pScanlineBuf, m_OrigWidth);
   } else {
     FX_BOOL bNext1D = m_pSrcBuf[bitpos / 8] & (1 << (7 - bitpos % 8));
@@ skipping 69 matching lines @@
     int height,
     int K,
     FX_BOOL EndOfLine,
     FX_BOOL EncodedByteAlign,
     FX_BOOL BlackIs1,
     int Columns,
     int Rows) {
   return new CCodec_FaxDecoder(src_buf, src_size, width, height, K, EndOfLine,
                                EncodedByteAlign, BlackIs1, Columns, Rows);
 }