stoc: must check *both* bDisposed and bInDispose

Implementation::inspect() was crashing with a null reflection_ in
CppunitTest_libreofficekit_tiledrendering because another thread
was disposing it.

Actually, why are there 2 bools for this and not one enum with 3 values?

Change-Id: Icd27145d3203e1f48a9841ee6251a50cb73f7988

stoc/source/inspect/introspection.cxx

@@ -1575,7 +1575,7 @@ css::uno::Reference<css::beans::XIntrospectionAccess> Implementation::inspect(
     throw (css::uno::RuntimeException, std::exception)
 {
     osl::MutexGuard g(m_aMutex);
-    if (rBHelper.bDisposed) {
+    if (rBHelper.bDisposed || rBHelper.bInDispose) {
         throw css::lang::DisposedException(
             getImplementationName(), static_cast<OWeakObject *>(this));
     }