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

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

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

Test-Parameters: trivial testlist=sanityn,recovery-small,recovery-single,lnet-selftest
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: I888fa9289839dbdf6970685395ae17f4d6a28d44
Reviewed-on: https://review.whamcloud.com/36388
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Ben Evans <bevans@cray.com>