nfsd4: remove state lock from nfsd4_load_reboot_recovery_data

That function is only called under nfsd_mutex: we know that because the
only caller is nfsd_svc, via

        nfsd_svc
          nfsd_startup
            nfs4_state_start
              nfsd4_client_tracking_init
                client_tracking_ops->init == nfsd4_load_reboot_recovery_data

The shared state accessed here includes:

        - user_recovery_dirname: used here, modified only by
          nfs4_reset_recoverydir, which can be verified to only be
          called under nfsd_mutex.
        - filesystem state, protected by i_mutex (handwaving slightly
	  here)
        - rec_file, reclaim_str_hashtbl, reclaim_str_hashtbl_size: other
          than here, used only from code called from nfsd or laundromat
          threads, both of which should be started only after this runs
          (see nfsd_svc) and stopped before this could run again (see
          nfsd_shutdown, called from nfsd_last_thread).
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4recover.c

@@ -509,11 +509,9 @@ nfsd4_load_reboot_recovery_data(struct net *net)
 {
 	int status;
 
-	nfs4_lock_state();
 	status = nfsd4_init_recdir();
 	if (!status)
 		status = nfsd4_recdir_load(net);
-	nfs4_unlock_state();
 	if (status)
 		printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
 	return status;