Implement BlRegisterProtocol() routine

xtldr2/modules/dummy/dummy.c

@@ -45,7 +45,6 @@ XtLdrModuleMain(IN EFI_HANDLE ImageHandle,
                 IN PEFI_SYSTEM_TABLE SystemTable)
 {
     EFI_GUID DummyGuid = XT_XTOS_BOOT_PROTOCOL_GUID;
-    EFI_HANDLE Handle = NULL;
     EFI_STATUS Status;
 
     /* Open the XTLDR protocol */
@@ -63,6 +62,5 @@ XtLdrModuleMain(IN EFI_HANDLE ImageHandle,
     XtLdrProto->Boot.RegisterProtocol(L"XTOS", &DummyGuid);
 
     /* Register DUMMY protocol as XTOS boot protocol */
-    return SystemTable->BootServices->InstallProtocolInterface(&Handle, &DummyGuid, EFI_NATIVE_INTERFACE,
-                                                               &DummyProtocol);
+    return XtLdrProto->Protocol.Register(&DummyGuid, &DummyProtocol);
 }