nfsd4: remove redundant callback probe

Both nfsd4_init_conn and alloc_init_session are probing the callback
channel, harmless but pointless.

Also, nfsd4_init_conn should probably be probing in the "unknown" case
as well.  In fact I don't see any harm to just doing it unconditionally
when we get a new backchannel connection.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -861,8 +861,7 @@ static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, str
 	if (ret)
 		/* oops; xprt is already down: */
 		nfsd4_conn_lost(&conn->cn_xpt_user);
-	if (ses->se_client->cl_cb_state == NFSD4_CB_DOWN &&
-			conn->cn_flags & NFS4_CDFC4_BACK) {
+	if (conn->cn_flags & NFS4_CDFC4_BACK) {
 		/* callback channel may be back up */
 		nfsd4_probe_callback(ses->se_client);
 	}
@@ -979,7 +978,6 @@ static struct nfsd4_session *init_session(struct svc_rqst *rqstp, struct nfsd4_s
 		rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
 		clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
 	}
-	nfsd4_probe_callback(clp);
 	return new;
 }