Fix how GUID is passed to BlInvokeBootProtocol()

xtldr2/protocol.c

@@ -40,7 +40,7 @@ BlFindBootProtocol(IN PWCHAR SystemType,
         if(RtlCompareWideStringInsensitive(ProtocolEntry->SystemType, SystemType, 0) == 0)
         {
             /* Boot protocol matched, return success */
-            BootProtocolGuid = &ProtocolEntry->Guid;
+            *BootProtocolGuid = ProtocolEntry->Guid;
             return STATUS_EFI_SUCCESS;
         }