nfsd: clean up grace period on early exit

If nfsd was shut down before the grace period ended, we could end up
with a freed object still on grace_list. Thanks to Jeff Moyer for
reporting the resulting list corruption warnings.

Signed-off-by: J. Bruce Fields <[e-mail]>
Tested-by: Jeff Moyer <[e-mail]>

fs/lockd/svc.c

···
 	}
 	flush_signals(current);
 	cancel_delayed_work_sync(&grace_period_end);
+	locks_end_grace(&lockd_manager);
 	if (nlmsvc_ops)
 		nlmsvc_invalidate_all();
 	nlm_shutdown_hosts();

fs/nfsd/nfs4state.c

···
 {
 	cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
 	destroy_workqueue(laundry_wq);
+	locks_end_grace(&nfsd4_manager);
 	nfs4_lock_state();
 	nfs4_release_reclaim();
 	__nfs4_state_shutdown();