Get rid of most instance of 'foo != NULL'

fpdfsdk/src/fxedit/fxet_module.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 "fpdfsdk/include/fxedit/fxet_edit.h"
 #include "fpdfsdk/include/fxedit/fxet_list.h"
 #include "fpdfsdk/include/fxedit/fxet_stub.h"
 
 /* ---------------------- IFX_Edit ---------------------- */
 
 IFX_Edit* IFX_Edit::NewEdit() {
   if (IPDF_VariableText* pVT = IPDF_VariableText::NewVariableText()) {
     return new CFX_Edit(pVT);
   }
 
   return NULL;
 }
 
 void IFX_Edit::DelEdit(IFX_Edit* pEdit) {
-  ASSERT(pEdit != NULL);
-
   IPDF_VariableText::DelVariableText(pEdit->GetVariableText());
 
   delete (CFX_Edit*)pEdit;
 }
 
 /* ---------------------- IFX_List ---------------------- */
 
 IFX_List* IFX_List::NewList() {
   return new CFX_ListCtrl();
 }
 
 void IFX_List::DelList(IFX_List* pList) {
-  ASSERT(pList != NULL);
-
+  ASSERT(pList);
   delete (CFX_ListCtrl*)pList;
 }