EX-4841 ofd: Return EOPNOTSUPP instead of EPROTO

EX-4841 ofd: Return EOPNOTSUPP instead of EPROTO

Modify server to return -EOPNOTSUPP instead of
-EPROTO for unsupported fallocate modes

Lustre-commit: TBD (5ad69eae24a4f1a6bc02a9fa9d66b0ed1a57fe84)
Lustre-change: https://review.whamcloud.com/46516

Fixes: 7462e8cad730 ("LU-14160 fallocate: Add punch mode to fallocate")

Signed-off-by: arshad.hussain@aeoncomputing.com
Change-Id: Id203c0b9abbdd674af33f1f78e81ae7fe105e90f
Reviewed-on: https://review.whamcloud.com/46527
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>