DuetPkg FSVariable: Minor update to the Data parameter for GetVariable()

UEFI 2.6 spec has minor update to the Data parameter for GetVariable(),
and no real functional behavior change.

The modifier of Data parameter:
OUT VOID *Data
->
OUT VOID *Data OPTIONAL

The comments of Data parameter:
Data	The buffer to return the contents of the variable.
->
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.

The patch is to follow the spec to update the implementation.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19772 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/DuetPkg/FSVariable/FSVariable.c b/DuetPkg/FSVariable/FSVariable.c
index 5e72f9f2acd86cf65fa98788991cce52cfb1efcf..06df161e5debdd6beb3eb9228a220f0c29a35b94 100644 (file)
--- a/DuetPkg/FSVariable/FSVariable.c
+++ b/DuetPkg/FSVariable/FSVariable.c
@@ -6,7 +6,7 @@ disk. They can be changed by user. BIOS is not able to protoect those.
 Duet trusts all meta data from disk. If variable code, variable metadata and variable\r
 data is modified in inproper way, the behavior is undefined.\r
 \r
-Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
@@ -1305,7 +1305,7 @@ DuetGetVariable (
   IN      EFI_GUID          *VendorGuid,\r
   OUT     UINT32            *Attributes OPTIONAL,\r
   IN OUT  UINTN             *DataSize,\r
-  OUT     VOID              *Data\r
+  OUT     VOID              *Data OPTIONAL\r
   )\r
 /*++\r
 \r
@@ -1320,7 +1320,8 @@ Arguments:
   Attributes OPTIONAL             Attribute value of the variable found\r
   DataSize                        Size of Data found. If size is less than the\r
                                   data, this value contains the required size.\r
-  Data                            Data pointer\r
+  Data                            The buffer to return the contents of the variable. May be NULL\r
+                                  with a zero DataSize in order to determine the size buffer needed.\r
 \r
 Returns:\r
 \r