Staging: comedi: fix brace coding style issue in dt2817.c

This is a patch to the dt2817.c file that fixes up all coding style
issues found by the checkpatch.pl tool

Signed-off-by: Sunny Aujla <sunnyfedora99@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>