staging: comedi: Fix 80 characters limit and printk issues in skel.c

This is a patch to the skel.c file that fixes the 80 characters limit and
printk warnings found by the checkpatch.pl tool

Signed-off-by: Ellwyn Cole <ellwync@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>