Add name_lookup function in object_ops.

diff --git a/server/handle.c b/server/handle.c
index 0a3a67b..b9312ce 100644
--- a/server/handle.c
+++ b/server/handle.c
@@ -108,6 +108,7 @@
     NULL,                            /* satisfied */
     no_signal,                       /* signal */
     no_get_fd,                       /* get_fd */
+    no_lookup_name,                  /* lookup_name */
     no_close_handle,                 /* close_handle */
     handle_table_destroy             /* destroy */
 };