Add Missing invocations to VA_END() for VA_START().

Signed-off-by: rsun3
Reviewed-by: lgao4

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12979 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:3bbe68a3627e7c75474955352f27b923c5831ad7

Platforms/OvmfPkg/EmuVariableFvbRuntimeDxe/Fvb.c

@@ -2,7 +2,7 @@
   Firmware Block Services to support emulating non-volatile variables
   by pretending that a memory buffer is storage for the NV variables.
 
-  Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2012, 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
@@ -379,6 +379,7 @@ FvbProtocolEraseBlocks (
       );
     VA_START (args, This);
     PlatformFvbBlocksErased (This, args);
+    VA_END (args);
   }
 
   return EFI_SUCCESS;