LU-6142 misc: Fix style issues for lustre_req_layout.h

LU-6142 misc: Fix style issues for lustre_req_layout.h

This patch fixes issues reported by checkpatch
for file lustre/include/lustre_req_layout.h

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I7b2595244f8c4cf3a90a28d447612fe9ea9df6f5
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56301
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Aurelien Degremont <adegremont@nvidia.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>