LU-6142 ost: Fix style issues for ost_handler.c

LU-6142 ost: Fix style issues for ost_handler.c

This patch fixes issues reported by checkpatch
for file lustre/ost/ost_handler.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: Ib779a2bdcd0ea3ada49e1aa2059acb17134d4a08
Reviewed-on: https://review.whamcloud.com/38787
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Ben Evans <beevans@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>