LU-6142 osd-zfs: Fix style issues for osd_internal.h

LU-6142 osd-zfs: Fix style issues for osd_internal.h

This patch fixes issues reported by checkpatch
for file lustre/osd-zfs/osd_internal.h

Test-Parameters: trivial fstype=zfs
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Iba857ae53a1a579dfc3ef6e422bcb3c47dd88cf1
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54263
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>