LU-6142 utils: Fix style issues for lustre_cfg.c

LU-6142 utils: Fix style issues for lustre_cfg.c

This patch fixes issues reported by checkpatch
for file lustre/utils/lustre_cfg.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: I4617daabd111309cac11c975df6ee0a897379115
Reviewed-on: https://review.whamcloud.com/38643
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>