Revert "Remove FX_Alloc() null checks now that it can't return NULL."

core/src/fxcodec/codec/fx_codec.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 "codec_int.h"
 CCodec_ModuleMgr::CCodec_ModuleMgr()
 {
@@ skipping 315 matching lines @@
     m_SrcSize = src_size;
     m_OutputWidth = m_OrigWidth = width;
     m_OutputHeight = m_OrigHeight = height;
     m_nComps = nComps;
     m_bpc = bpc;
     m_bColorTransformed = FALSE;
     m_DownScale = 1;
     m_Pitch = (width * nComps * bpc + 31) / 32 * 4;
     m_dwLineBytes = (width * nComps * bpc + 7) / 8;
     m_pScanline = FX_Alloc(FX_BYTE, m_Pitch);
+    if (m_pScanline == NULL) {
+        return FALSE;
+    }
     return CheckDestSize();
 }
 FX_BOOL CCodec_RLScanlineDecoder::v_Rewind()
 {
     FXSYS_memset32(m_pScanline, 0, m_Pitch);
     m_SrcOffset = 0;
     m_bEOD = FALSE;
     m_Operator = 0;
     return TRUE;
 }
@@ skipping 84 matching lines @@
 ICodec_ScanlineDecoder* CCodec_BasicModule::CreateRunLengthDecoder(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height,
         int nComps, int bpc)
 {
     CCodec_RLScanlineDecoder* pRLScanlineDecoder = new CCodec_RLScanlineDecoder;
     if (!pRLScanlineDecoder->Create(src_buf, src_size, width, height, nComps, bpc)) {
         delete pRLScanlineDecoder;
         return NULL;
     }
     return pRLScanlineDecoder;
 }