Staging: comedi: fix blank line issue in das16.c

This is a patch to the das16.c file that fixes up a blank line after
function/struct/union/enum  check found by the checkpatch.pl tool

Signed-off-by: Ravishankar Karkala Mallikarjunayya <ravishankarkm32@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>