[gnome-logs] Avoid a segfault when updating the boot menu

[David King <davidk src gnome org>]

commit 86ae341d6837e7b6b36bd8e0c65be0211ef37eba
Author: David King <amigadave amigadave com>
Date:   Fri Jun 7 14:39:33 2019 +0100

    Avoid a segfault when updating the boot menu

 src/gl-eventtoolbar.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/src/gl-eventtoolbar.c b/src/gl-eventtoolbar.c
index 8107448..9a8bd5c 100644
--- a/src/gl-eventtoolbar.c
+++ b/src/gl-eventtoolbar.c
@@ -55,13 +55,17 @@ gl_event_toolbar_update_boot_menu_label (GlEventToolbar *toolbar,
 
     boot_menu = gtk_menu_button_get_menu_model (GTK_MENU_BUTTON (priv->menu_button));
     section = g_menu_model_get_item_link (boot_menu, 0, "section");
-    menu_item = g_menu_item_new_from_model (section, 0);
-    g_menu_item_set_label (menu_item, latest_boot);
 
-    g_menu_remove (G_MENU (section), 0);
-    g_menu_insert_item (G_MENU (section), 0, menu_item);
+    if (g_menu_model_get_n_items (section) < 0)
+    {
+        menu_item = g_menu_item_new_from_model (section, 0);
+        g_menu_item_set_label (menu_item, latest_boot);
+
+        g_menu_remove (G_MENU (section), 0);
+        g_menu_insert_item (G_MENU (section), 0, menu_item);
 
-    g_object_unref (menu_item);
+        g_object_unref (menu_item);
+    }
 }
 
 void