Using g_clear_object() instead of g_object_unref() in ag_window_set_chart

src/ag-chart.c

@@ -854,6 +854,7 @@ ag_chart_load_from_file(GFile *file, GError **err)
     house_system_enum_name = g_utf8_strdown(house_system_name, -1);
     g_free(house_system_name);
     house_system_class = g_type_class_ref(GSWE_TYPE_HOUSE_SYSTEM);
+
     if ((enum_value = g_enum_get_value_by_nick(
                  G_ENUM_CLASS(house_system_class),
                  house_system_enum_name

src/ag-window.c

@@ -1233,7 +1233,7 @@ ag_window_set_chart(AgWindow *window, AgChart *chart)
                 chart_changed,
                 window
             );
-        g_object_unref(priv->chart);
+        g_clear_object(&(priv->chart));
     }
 
     priv->chart = chart;