[glib: 1/2] gfdonotificationbackend: hold a strong ref on backend

[Philip Withnall <pwithnall src gnome org>]

commit 5a73eef7498bacce9b5b176a927af8ad20d2947e
Author: Arnaud Rebillout <elboulangero gmail com>
Date:   Thu Jun 14 11:21:11 2018 +0700

    gfdonotificationbackend: hold a strong ref on backend
    
    This is to avoid race between dispose() being called on the
    GFdoNotificationBackend instance, and any pending operations which are
    still waiting on a D-Bus reply when it’s disposed.
    
    (thx to Philip Withnall for pointing that out)
    
    Signed-off-by: Arnaud Rebillout <elboulangero gmail com>

 gio/gfdonotificationbackend.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gio/gfdonotificationbackend.c b/gio/gfdonotificationbackend.c
index ab5329497..c4fa0dc1d 100644
--- a/gio/gfdonotificationbackend.c
+++ b/gio/gfdonotificationbackend.c
@@ -67,6 +67,7 @@ freedesktop_notification_free (gpointer data)
 {
   FreedesktopNotification *n = data;
 
+  g_object_unref (n->backend);
   g_free (n->id);
   g_free (n->default_action);
   if (n->default_action_target)
@@ -83,7 +84,7 @@ freedesktop_notification_new (GFdoNotificationBackend *backend,
   FreedesktopNotification *n;
 
   n = g_slice_new0 (FreedesktopNotification);
-  n->backend = backend;
+  n->backend = g_object_ref (backend);
   n->id = g_strdup (id);
   n->notify_id = 0;
   g_notification_get_default_action (notification,