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

core/src/fxcrt/fx_extension.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/include/fxcrt/fx_basic.h"
 #include "core/include/fxcrt/fx_ext.h"
 #include "extension.h"
 
@@ skipping 257 matching lines @@
     ;
   ::srand((tmCur << 16) | (tmLast & 0xFFFF));
 #endif
   while (iCount-- > 0) {
     *pBuffer++ = (FX_DWORD)((::rand() << 16) | (::rand() & 0xFFFF));
   }
 }
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 FX_BOOL FX_GenerateCryptoRandom(FX_DWORD* pBuffer, int32_t iCount) {
   HCRYPTPROV hCP = NULL;
-  if (!::CryptAcquireContext(&hCP, NULL, NULL, PROV_RSA_FULL, 0) ||
-      hCP == NULL) {
+  if (!::CryptAcquireContext(&hCP, NULL, NULL, PROV_RSA_FULL, 0) || !hCP) {
     return FALSE;
   }
   ::CryptGenRandom(hCP, iCount * sizeof(FX_DWORD), (uint8_t*)pBuffer);
   ::CryptReleaseContext(hCP, 0);
   return TRUE;
 }
 #endif
 void FX_Random_GenerateCrypto(FX_DWORD* pBuffer, int32_t iCount) {
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   FX_GenerateCryptoRandom(pBuffer, iCount);
 #else
   FX_Random_GenerateBase(pBuffer, iCount);
 #endif
 }