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

@@ -241,16 +241,13 @@ void nfs4_free_client(struct nfs_client *clp)
  */
 static int nfs4_init_callback(struct nfs_client *clp)
 {
-	int error;
-
-	if (clp->rpc_ops->version == 4) {
 	struct rpc_xprt *xprt;
+	int error;
 
 	xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 
 	if (nfs4_has_session(clp)) {
-			error = xprt_setup_backchannel(xprt,
-						NFS41_BC_MIN_CALLBACKS);
+		error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
 		if (error < 0)
 			return error;
 	}
@@ -262,7 +259,7 @@ static int nfs4_init_callback(struct nfs_client *clp)
 		return error;
 	}
 	__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
-	}
+
 	return 0;
 }