Staging: comedi: fix yet another brace coding style issue in ni_labpc.c

This is a patch to the ni_labpc.c file that fixes up all the brace
warnings found by the checkpatch.pl tool

Signed-off-by: Maurice Dawson <mauricedawson2699@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>