staging: unisys: refactor my_device_changestate()

Fix the CamelCase names:

busNo => bus_no
devNo => dev_no
pDevInfo => dev_info

Update all references to use the new names, and remove the goto and
label entirely.

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