Staging: comedi: adv_pci1710: an issue in line over 80 fixed

An issue in 'line over 80 characters' fixed by removing over-lined comment
to the previous line.

Signed-off-by: Sam Asadi <asadi.samuel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>