LU-6142 build: Fix style issues for lustre_compat.h

LU-6142 build: Fix style issues for lustre_compat.h

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

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I2e91f4faba98d3862d8180f622478518c4b8b0c3
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53907
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>