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

core/src/fxge/ge/fx_ge_text.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/fxge/fx_ge.h"
 #include "../../../include/fxge/fx_freetype.h"
 #include "../../../include/fxcodec/fx_codec.h"
 #include "text_int.h"
@@ skipping 185 matching lines @@
                 }
             }
         }
     }
     if (pCache == NULL) {
         pCache = CFX_GEModule::Get()->GetFontCache();
     }
     CFX_FaceCache* pFaceCache = pCache->GetCachedFace(pFont);
     FX_FONTCACHE_DEFINE(pCache, pFont);
     FXTEXT_GLYPHPOS* pGlyphAndPos = FX_Alloc(FXTEXT_GLYPHPOS, nChars);
+    if (!pGlyphAndPos) {
+        return FALSE;
+    }
     int iChar;
     deviceCtm = char2device;
     CFX_AffineMatrix matrixCTM = GetCTM();
     FX_FLOAT scale_x = FXSYS_fabs(matrixCTM.a);
     FX_FLOAT scale_y = FXSYS_fabs(matrixCTM.d);
     deviceCtm.Concat(scale_x, 0, 0, scale_y, 0, 0);
     text2Device.Concat(scale_x, 0, 0, scale_y, 0, 0);
     for (iChar = 0; iChar < nChars; iChar ++) {
         FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[iChar];
         const FXTEXT_CHARPOS& charpos = pCharPos[iChar];
@@ skipping 1456 matching lines @@
 {
     va_list argList;
     va_start(argList, count);
     for (int i = 0; i < count; i ++) {
         int p = va_arg(argList, int);
         ((FX_DWORD*)m_Key)[i] = p;
     }
     va_end(argList);
     m_KeyLen = count * sizeof(FX_DWORD);
 }