staging: comedi: adl_pci9118: fix a misaligned comment

As pointed out by Hartley Sweeten, one of my recent patches resulted in
the start of a multi-line comment ending up misaligned.  Fix it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>