SecurityPkg EsalVariableDxeSal: Use input Global to make code more clear

SecurityPkg\VariableAuthenticated\EsalVariableDxeSal\Variable.c
AutoUpdateLangVariable()
Global->PlatformLangCodes[VirtualMode] = AllocateRuntimeCopyPool
  (DataSize, Data);
ASSERT (mVariableModuleGlobal->PlatformLangCodes[VirtualMode] != NULL);

The patch is to use Global instead of mVariableModuleGlobal in the
ASSERT (XXX) to make code more clear although mVariableModuleGlobal is
equal to Global actually.

Cc: Chao Zhang <[email protected]>
Cc: Amy Chan <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <[email protected]>
Reviewed-by: Chao Zhang <[email protected]>
Reviewed-by: Amy Chan <[email protected]>
Reviewed-by: Giri P Mudusuru <[email protected]>

SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c

@@ -1,7 +1,7 @@
 /** @file
   The implementation of Extended SAL variable services.
 
-Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials 
 are licensed and made available under the terms and conditions of the BSD License 
 which accompanies this distribution.  The full text of the license may be found at 
@@ -1661,7 +1661,7 @@ AutoUpdateLangVariable(
       FreePool (Global->PlatformLangCodes[VirtualMode]);
     }
     Global->PlatformLangCodes[VirtualMode] = AllocateRuntimeCopyPool (DataSize, Data);
-    ASSERT (mVariableModuleGlobal->PlatformLangCodes[VirtualMode] != NULL);
+    ASSERT (Global->PlatformLangCodes[VirtualMode] != NULL);
 
     //
     // PlatformLang holds a single language from PlatformLangCodes,