MdeModulePkg: Rename VarCheckHiiLibNullClass as VarCheckHiiLib.

No functional changes.

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Hongbin1 Zhang <hongbin1.zhang@intel.com>
Cc: Wei6 Xu <wei6.xu@intel.com>
Cc: Dun Tan <dun.tan@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>

Signed-off-by: Yuanhao Xie <yuanhao.xie@intel.com>

MdeModulePkg/Library/VarCheckHiiLib/VarCheckHiiLib.c

@@ -614,7 +614,7 @@ DumpVarCheckHii (
 **/
 EFI_STATUS
 EFIAPI
-VarCheckHiiLibNullClassConstructor (
+VarCheckHiiLibConstructor (
   IN EFI_HANDLE        ImageHandle,
   IN EFI_SYSTEM_TABLE  *SystemTable
   )

MdeModulePkg/Library/VarCheckHiiLib/VarCheckHiiLib.inf

@@ -1,5 +1,5 @@
 ## @file
-#  NULL class library to register var check HII handler.
+#  VarCheckHiiLib library to register var check HII handler.
 #
 #  Copyright (c) 2015 - 2017, Intel Corporation. All rights reserved.<BR>
 #
@@ -15,10 +15,10 @@
   MODULE_TYPE                    = DXE_RUNTIME_DRIVER
   VERSION_STRING                 = 1.0
   LIBRARY_CLASS                  = NULL|DXE_RUNTIME_DRIVER DXE_SMM_DRIVER
-  CONSTRUCTOR                    = VarCheckHiiLibNullClassConstructor
+  CONSTRUCTOR                    = VarCheckHiiLibConstructor
 
 [Sources]
-  VarCheckHiiLibNullClass.c
+  VarCheckHiiLib.c
   VarCheckHii.h
   VarCheckHiiGenFromFv.c
   VarCheckHiiGenFromHii.c