staging: unisys: refactor my_device_create()

Fix local CamelCase variable names:

busNo => bus_no
devNo => dev_no
pDevinfo => dev_info
pBusInfo => bus_info
Away => cleanup

Update references to use the corrected names, and change the kzalloc()
to use the variable itself rather than the type.

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