Staging: comedi: fix line longer than 80 chars in cb_pcidas64.c

This patch fixes coding style errors reported by checkpatch.pl for
cb_pcidas64.c, about too long source code lines.

Signed-off-by: Amaury Denoyelle <amaury.denoyelle@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>