staging: comedi: Fixes Coding Style Warning in file das08.h

The Patch fixes following Warnings, found using checkpatch.pl, in file das08.h

./scripts/checkpatch.pl --file --terse drivers/staging/comedi/drivers/das08.h
drivers/staging/comedi/drivers/das08.h:43: WARNING: line over 80 characters
total: 0 errors, 1 warnings, 50 lines checked

Signed-off-by: Sheetal Tigadoli <sheetal.tigadoli@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>