staging: unisys: refactor bus_destroy()

Fix CamelCase names:

busNo => bus_no
pBusInfo => bus_info

Update all references to use the corrected names, and remove the goto
statements and labels entirely.

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