[WIN32K] Deny deviceless calls to EngDeviceIoControl

This fixes BSOD happening in ntoskrnl coming from win32k under certain
conditions with 3rd party display drivers (such as VBox or VMware)

win32ss/gdi/eng/device.c

@@ -485,6 +485,11 @@ EngDeviceIoControl(
 
     TRACE("EngDeviceIoControl() called\n");
 
+    if (!hDevice)
+    {
+        return ERROR_INVALID_HANDLE;
+    }
+
     KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
 
     DeviceObject = (PDEVICE_OBJECT) hDevice;