nfsd: remove obsolete comment from nfs4_alloc_stid

idr_alloc_cyclic() is what guarantees that now, not this long-gone trick.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs4state.c

@@ -946,15 +946,6 @@ struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *sla
 	spin_lock_init(&stid->sc_lock);
 	INIT_LIST_HEAD(&stid->sc_cp_list);
 
-	/*
-	 * It shouldn't be a problem to reuse an opaque stateid value.
-	 * I don't think it is for 4.1.  But with 4.0 I worry that, for
-	 * example, a stray write retransmission could be accepted by
-	 * the server when it should have been rejected.  Therefore,
-	 * adopt a trick from the sctp code to attempt to maximize the
-	 * amount of time until an id is reused, by ensuring they always
-	 * "increase" (mod INT_MAX):
-	 */
 	return stid;
 out_free:
 	kmem_cache_free(slab, stid);