[ofw] Add Assert to debug BS while deleting WDF device

[Hefty, Sean]

> We need to understand what exactly is happening.  The winmad and winverbs
> drivers to not interact with ipoib, so I don't understand the relation.
> [Uri Habusha] you correct by OpenSm use winmad and it also disabled

So, the crash is in winmad in WmPowerD0Exit at WdfObjectDelete?  And opensm is running at the time?  And the HCA driver was disabled?  Is this all correct?