staging: unisys: refactor uisctrl_unregister_req_handler_ex()

Get rid of the unnecessary goto statement and just return directly.

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>