LU-6142 tests: Fix style issues for createmany-mpi.c

LU-6142 tests: Fix style issues for createmany-mpi.c

This patch fixes issues reported by checkpatch
for file lustre/tests/mpi/createmany-mpi.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: I365f533bbd68a256be971486cd1232bddca4342f
Reviewed-on: https://review.whamcloud.com/35435
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>