NFS: Remove rpcbind cleanup for NFSv4.0 callback

The NFS client's NFSv4.0 callback listeners are created with
SVC_SOCK_ANONYMOUS, therefore svc_setup_socket() does not register
them with the client's rpcbind service.

And, note that nfs_callback_down_net() does not call
svc_rpcb_cleanup() at all when shutting down the callback server.

Even if svc_setup_socket() were to attempt to register or unregister
these sockets, the callback service has vs_hidden set, which shunts
the rpcbind upcalls.

The svc_rpcb_cleanup() error flow was introduced by
commit c946556b8749 ("NFS: move per-net callback thread
initialization to nfs_callback_up_net()"). It doesn't appear in the
code that was relocated by that commit.

Therefore, there is no need to call svc_rpcb_cleanup() when listener
creation fails during callback server start-up.

Signed-off-by: Chuck Lever <[e-mail]>

fs/nfs/callback.c

···
 	ret = svc_bind(serv, net);
 	if (ret < 0) {
 		printk(KERN_WARNING "NFS: bind callback service failed\n");
-		goto err_bind;
+		goto err;
 	}
 
 	ret = 0;
···
 
 	if (ret < 0) {
 		printk(KERN_ERR "NFS: callback service start failed\n");
-		goto err_socks;
+		goto err;
 	}
 	return 0;
 
-err_socks:
-	svc_rpcb_cleanup(serv, net);
-err_bind:
+err:
 	nn->cb_users[minorversion]--;
 	dprintk("NFS: Couldn't create callback socket: err = %d; "
 			"net = %x\n", ret, net->ns.inum);