[gnome-software] trivial: Fix a tiny memory leak in the dummy plugin

[Richard Hughes <rhughes src gnome org>]

commit 00b48f6e88e6b303e0d7c211f9717335870f0482
Author: Richard Hughes <richard hughsie com>
Date:   Wed Feb 22 16:09:45 2017 +0000

    trivial: Fix a tiny memory leak in the dummy plugin

 src/plugins/gs-plugin-dummy.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/gs-plugin-dummy.c b/src/plugins/gs-plugin-dummy.c
index 74e9b64..0dee6e0 100644
--- a/src/plugins/gs-plugin-dummy.c
+++ b/src/plugins/gs-plugin-dummy.c
@@ -96,6 +96,8 @@ gs_plugin_destroy (GsPlugin *plugin)
        GsPluginData *priv = gs_plugin_get_data (plugin);
        if (priv->quirk_id > 0)
                g_source_remove (priv->quirk_id);
+       if (priv->auth != NULL)
+               g_object_unref (priv->auth);
        if (priv->cached_origin != NULL)
                g_object_unref (priv->cached_origin);
 }