LU-15671 llite: cleanup code style in xattr.c

LU-15671 llite: cleanup code style in xattr.c

Clean up code style in llite/xattr.c.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I511d12daefdb509adbee65aaba9dea911ebaa18a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52418
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>