server: Refuse to close handles in other processes if they have an associated fd.
diff --git a/server/sock.c b/server/sock.c
index c1a7a8d..9637469 100644
--- a/server/sock.c
+++ b/server/sock.c
@@ -114,7 +114,7 @@
     sock_get_fd,                  /* get_fd */
     sock_map_access,              /* map_access */
     no_lookup_name,               /* lookup_name */
-    no_close_handle,              /* close_handle */
+    fd_close_handle,              /* close_handle */
     sock_destroy                  /* destroy */
 };