usbohci: assertion failure 'WorkItem->List.Flink == ((void *)0)' on boot

This happens with a USB mouse connected. Without the mouse, the system boots past this point.

First stage is successful even with the mouse (hidparse lists some stuff etc). Second stage fails with this assertion.
Issue is in the call to ExQueueWorkItem in OhciDefferedRoutine (usbohci/hardware.cpp:1529).
There are two problems here:

• the work item is already queued, as seen by the fact that its list item is valid
• it is wrong to use ExQueueWorkItem for device-related tasks