server: Add an open_file() function to the object operations.
diff --git a/server/request.c b/server/request.c
index c01a70e..20fe435 100644
--- a/server/request.c
+++ b/server/request.c
@@ -97,6 +97,7 @@
     no_get_fd,                     /* get_fd */
     no_map_access,                 /* map_access */
     no_lookup_name,                /* lookup_name */
+    no_open_file,                  /* open_file */
     no_close_handle,               /* close_handle */
     master_socket_destroy          /* destroy */
 };