staging: unisys: refactor uisctrl_register_req_handler_ex()

Fix CamelCase local variable name:

pReqHandlerInfo => req_handler

Get rid of the useless goto and just return straight away on an error.

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>