Add name_lookup function in object_ops.

diff --git a/server/registry.c b/server/registry.c
index eef7dc9..0a0ca23 100644
--- a/server/registry.c
+++ b/server/registry.c
@@ -145,6 +145,7 @@
     NULL,                    /* satisfied */
     no_signal,               /* signal */
     no_get_fd,               /* get_fd */
+    no_lookup_name,          /* lookup_name */
     key_close_handle,        /* close_handle */
     key_destroy              /* destroy */
 };