[PATCH] MdeModulePkg Variable: Add missing change in dd59d95e1994

[Star Zeng <star.zeng@intel.com>]

dd59d95e1994 updated *.c file, but forgot to update *.h file.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.h b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.h
index 55df13191b43..cd0d9568158a 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.h
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.h
@@ -2,7 +2,7 @@
   The internal header file includes the common header files, defines
   internal structure and functions used by Variable modules.
 
-Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2017, 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
@@ -514,7 +514,8 @@ GetFvbInfoByAddress (
   @param Attributes                 Attribute value of the variable found.
   @param DataSize                   Size of Data found. If size is less than the
                                     data, this value contains the required size.
-  @param Data                       Data pointer.
+  @param Data                       The buffer to return the contents of the variable. May be NULL
+                                    with a zero DataSize in order to determine the size buffer needed.
 
   @return EFI_INVALID_PARAMETER     Invalid parameter.
   @return EFI_SUCCESS               Find the specified variable.
@@ -529,7 +530,7 @@ VariableServiceGetVariable (
   IN      EFI_GUID          *VendorGuid,
   OUT     UINT32            *Attributes OPTIONAL,
   IN OUT  UINTN             *DataSize,
-  OUT     VOID              *Data
+  OUT     VOID              *Data OPTIONAL
   );
 
 /**
-- 
2.7.0.windows.1