Update code to support VS2013 tool chain.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15695 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/HiiDatabaseDxe/ConfigRouting.c

@@ -2329,6 +2329,8 @@ GetBlockElement (
   IFR_BLOCK_DATA       *NextBlockData;
   UINTN                Length;
 
+  TmpBuffer = NULL;
+
   //
   // Init RequestBlockArray
   //
@@ -4432,6 +4434,8 @@ HiiBlockToConfig (
   CHAR16                              *TemString;
   CHAR16                              TemChar;
 
+  TmpBuffer = NULL;
+
   if (This == NULL || Progress == NULL || Config == NULL) {
     return EFI_INVALID_PARAMETER;
   }
@@ -4728,6 +4732,8 @@ HiiConfigToBlock (
   UINTN                               BufferSize;
   UINTN                               MaxBlockSize;
 
+  TmpBuffer = NULL;
+
   if (This == NULL || BlockSize == NULL || Progress == NULL) {
     return EFI_INVALID_PARAMETER;
   }