NFS: Clean up nfs4_init_callback()

nfs4_init_callback() is never invoked for NFS versions other than 4.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfs4client.c

@@ -241,28 +241,25 @@ void nfs4_free_client(struct nfs_client *clp)
  */
 static int nfs4_init_callback(struct nfs_client *clp)
 {
+	struct rpc_xprt *xprt;
 	int error;
 
-	if (clp->rpc_ops->version == 4) {
-		struct rpc_xprt *xprt;
+	xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 
-		xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
-
-		if (nfs4_has_session(clp)) {
-			error = xprt_setup_backchannel(xprt,
-						NFS41_BC_MIN_CALLBACKS);
-			if (error < 0)
-				return error;
-		}
-
-		error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
-		if (error < 0) {
-			dprintk("%s: failed to start callback. Error = %d\n",
-				__func__, error);
+	if (nfs4_has_session(clp)) {
+		error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
+		if (error < 0)
 			return error;
-		}
-		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 	}
+
+	error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
+	if (error < 0) {
+		dprintk("%s: failed to start callback. Error = %d\n",
+			__func__, error);
+		return error;
+	}
+	__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
+
 	return 0;
 }