staging: comedi: daqboard2000: use usual block comment style

Reformat one of the block comments to conform to the usual style (it's
the only one that doesn't).

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>