LU-6142 tests: Fix style issues for runas.c

LU-6142 tests: Fix style issues for runas.c

This patch fixes issues reported by checkpatch
for file lustre/tests/runas.c

Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: Id0b658a0d9fabb520f3f087c0901047518e9f6cf
Reviewed-on: https://review.whamcloud.com/36384
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Ben Evans <bevans@cray.com>