shdocvw: Add SHDOCVW_LockModule()/SHDOCVW_UnlockModule() calls to ITaskbarList.

dlls/shdocvw/taskbarlist.c

@@ -71,6 +71,7 @@ static ULONG STDMETHODCALLTYPE taskbar_list_Release(ITaskbarList *iface)
     if (!refcount)
     {
         HeapFree(GetProcessHeap(), 0, This);
+        SHDOCVW_UnlockModule();
     }
 
     return refcount;
@@ -161,5 +162,7 @@ HRESULT TaskbarList_Create(IUnknown *outer, REFIID riid, void **taskbar_list)
         return hr;
     }
 
+    SHDOCVW_LockModule();
+
     return S_OK;
 }