LU-6142 fld: Fix style issues for fld_internal.h

LU-6142 fld: Fix style issues for fld_internal.h

This patch fixes issues reported by checkpatch
for file lustre/fid/fld_internal.h

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Id4e91c2a892015b847e9139eae357fc33644153f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54000
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>