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

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

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

Test-Parameters: trivial testlist=sanityn
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: Ibfd29751769c1b8339ac249ad1379c8d42250ae3
Reviewed-on: https://review.whamcloud.com/36438
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>