server: Don't bother with default entry points for objects that don't even return an fd.
diff --git a/server/queue.c b/server/queue.c
index 7335cfc..fa80d62 100644
--- a/server/queue.c
+++ b/server/queue.c
@@ -166,11 +166,11 @@
 {
     NULL,                        /* get_poll_events */
     msg_queue_poll_event,        /* poll_event */
-    no_flush,                    /* flush */
-    no_get_fd_type,              /* get_fd_type */
-    no_queue_async,              /* queue_async */
+    NULL,                        /* flush */
+    NULL,                        /* get_fd_type */
+    NULL,                        /* queue_async */
     NULL,                        /* reselect_async */
-    no_cancel_async              /* cancel async */
+    NULL                         /* cancel async */
 };