MdeModulePkg: Use IsZeroGuid API for zero GUID checking

Instead of comparing a GUID with gZeroGuid via the CompareGuid API, the
commit uses the IsZeroGuid API to check if the given GUID is a zero GUID.

Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Feng Tian <feng.tian@Intel.com>

MdeModulePkg/Universal/SetupBrowserDxe/Setup.c

@@ -181,7 +181,7 @@ UiFindMenuList (
     // Find the same FromSet.
     //
     if (MenuList->HiiHandle == HiiHandle) {
-      if (CompareGuid (&MenuList->FormSetGuid, &gZeroGuid)) {
+      if (IsZeroGuid (&MenuList->FormSetGuid)) {
         //
         // FormSetGuid is not specified.
         //
@@ -5689,7 +5689,7 @@ GetIfrBinaryData (
           //
           // Try to compare against formset GUID
           //
-          if (CompareGuid (FormSetGuid, &gZeroGuid) || 
+          if (IsZeroGuid (FormSetGuid) ||
               CompareGuid (ComparingGuid, (EFI_GUID *)(OpCodeData + sizeof (EFI_IFR_OP_HEADER)))) {
             break;
           }