staging: unisys: refactor destroy_device()

Fix the function declaration so it is a single line. Rename CamelCase local
variable names:

busNo => bus_no
devNo => dev_no

Fix use of uuid_le_cmp() to check for 0 instead of using !uuid_le_cmp(). Fix
spelling error DESTORY to correctly read DESTROY.

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