Index: /trunk/src/VBox/HostDrivers/Support/win/SUPLib-win.cpp
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/win/SUPLib-win.cpp	(revision 66653)
+++ /trunk/src/VBox/HostDrivers/Support/win/SUPLib-win.cpp	(revision 66654)
@@ -646,6 +646,6 @@
     if (pThis->hDevice != NULL)
     {
-        if (!NtClose((HANDLE)pThis->hDevice))
-            AssertFailed();
+        NTSTATUS rcNt = NtClose((HANDLE)pThis->hDevice);
+        Assert(NT_SUCCESS(rcNt));
         pThis->hDevice = NIL_RTFILE; /* yes, that's right */
     }