[glib] g_datalist_id_replace_data: Annotate the out parameter

[Philip Withnall <pwithnall src gnome org>]

commit 595a7e3bb21a61a50d700f9a2a00dcb29379eb70
Author: Mikhail Zabaluev <mikhail zabaluev gmail com>
Date:   Mon Oct 12 10:19:15 2015 +0300

    g_datalist_id_replace_data: Annotate the out parameter
    
    https://bugzilla.gnome.org/show_bug.cgi?id=756470

 glib/gdataset.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glib/gdataset.c b/glib/gdataset.c
index 28ec0c0..fed6df9 100644
--- a/glib/gdataset.c
+++ b/glib/gdataset.c
@@ -885,7 +885,7 @@ g_datalist_id_dup_data (GData          **datalist,
  * @oldval: (nullable): the old value to compare against
  * @newval: (nullable): the new value to replace it with
  * @destroy: (nullable): destroy notify for the new value
- * @old_destroy: (nullable): destroy notify for the existing value
+ * @old_destroy: (out) (optional): destroy notify for the existing value
  *
  * Compares the member that is associated with @key_id in
  * @datalist to @oldval, and if they are the same, replace