staging: unisys: Make serverdown synchronous

I don't see why serverdown should be async on a workqueue.  Just make it
synchronous, and remove some code in the process

Signed-off-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>