LU-6142 obdclass: Fix style issues for obd_config.c

LU-6142 obdclass: Fix style issues for obd_config.c

This patch fixes issues reported by checkpatch
for file lustre/obdclass/obd_config.c

Change-Id: If97513fe594ee76c9e153c33d644cd94c48f82c0
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Reviewed-on: https://review.whamcloud.com/33082
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>