NFSv4.1: Allow the server to recall all but one slot

If the server wants to leave us with only one slot, or it wants
to "shrink" our slot table to something larger than we have now,
then so be it.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/callback_proc.c

@@ -567,11 +567,6 @@ __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
 
 	fc_tbl = &cps->clp->cl_session->fc_slot_table;
 
-	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
-	if (args->crsa_target_highest_slotid >= fc_tbl->max_slots ||
-	    args->crsa_target_highest_slotid < 1)
-		goto out;
-
 	status = htonl(NFS4_OK);
 
 	nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);