staging: comedi: ni_tio: fix > 80 char comments

Tidy up some of the comments to fix some fo the the checkpatch.pl
warnings:

WARNING: line over 80 characters

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>