staging: comedi: das08.c: reformat remaining comments

Use the preferred style for block comments.  Squash double spaces after
the comment opening sequence for single-line comments.

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