Staging: comedi: fix missing KERN_facility level in ni_labpc.c

This is a patch to fix the "missing KERN_facility level" error found
when running the checkpatch.pl script

Signed-off-by: Aseem Sethi <aseemsethi@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>