nfsd4: shutdown callbacks on expiry

Once we've expired the client, there's no further purpose to the
callbacks; go ahead and shut down the callback client rather than
waiting for the last reference to go.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfs4state.c

@@ -697,9 +697,6 @@ shutdown_callback_client(struct nfs4_client *clp)
 static inline void
 free_client(struct nfs4_client *clp)
 {
-	shutdown_callback_client(clp);
-	if (clp->cl_cb_xprt)
-		svc_xprt_put(clp->cl_cb_xprt);
 	if (clp->cl_cred.cr_group_info)
 		put_group_info(clp->cl_cred.cr_group_info);
 	kfree(clp->cl_principal);
@@ -752,6 +749,9 @@ expire_client(struct nfs4_client *clp)
 				 se_perclnt);
 		release_session(ses);
 	}
+	shutdown_callback_client(clp);
+	if (clp->cl_cb_xprt)
+		svc_xprt_put(clp->cl_cb_xprt);
 	put_nfs4_client(clp);
 }