Staging: comedi: fix coding style issues in ni_labpc.c

This is a patch to the ni_labpc.c file that fixes the brace warnings and
comments over 80 characters found by the checkpatch.pl tool. Some code
still goes over 80 characters because I didn't know what to do with it.
Signed-off-by: Stewart Robertson <stewart_r@aliencamel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>