Bug 24032

	rndcontrol and pccard use of the interupt handler is incompatable
	with each other.  It is possible to remove the interupt handler
	of a installed card via rndcontrol -c irq.

	Inserting a card clears the interupt handler installed via
	rndcontrol without clearing the associated bit in the mask.

Fix: 

Minimum fix, rndcontrol -c should ensure that it is still the
	installed handler before trying to restore the handler saved
	via rndcontrol -s.

	A full fix would require two interupt handling tables one
	for rndcontrol to manipulate and for the devices to manipulate
	The handlers in the later called from the handlers in the
	former.

	There are other alternatives which require the code intalling
	the interupt handlers to know about add_interrupt_randomness
	and do the appopriate things.
How-To-Repeat: 
	rndcontrol -s <irq>
	insert card that wil use <irq>
	rndcontrol -c <irg>