[gnome-software] Fix a small memory leak in the AppStream plugin

[Richard Hughes <rhughes src gnome org>]

commit 31f93fedb86563d62e7bfcbf9ef05a2cda8dbcc1
Author: Richard Hughes <richard hughsie com>
Date:   Wed Jul 2 15:37:59 2014 +0100

    Fix a small memory leak in the AppStream plugin

 src/plugins/gs-plugin-appstream.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/gs-plugin-appstream.c b/src/plugins/gs-plugin-appstream.c
index 2229bc7..202d49c 100644
--- a/src/plugins/gs-plugin-appstream.c
+++ b/src/plugins/gs-plugin-appstream.c
@@ -792,6 +792,7 @@ gs_plugin_add_category_apps (GsPlugin *plugin,
                if (!ret)
                        goto out;
                gs_plugin_add_app (list, app);
+               g_object_unref (app);
        }
        gs_profile_stop (plugin->profile, "appstream::add-category-apps");
 out:
@@ -833,6 +834,7 @@ gs_plugin_add_search (GsPlugin *plugin,
                        if (!ret)
                                goto out;
                        gs_plugin_add_app (list, app);
+                       g_object_unref (app);
                }
        }
        gs_profile_stop (plugin->profile, "appstream::search");
@@ -874,6 +876,7 @@ gs_plugin_add_installed (GsPlugin *plugin,
                        if (!ret)
                                goto out;
                        gs_plugin_add_app (list, app);
+                       g_object_unref (app);
                }
        }
        gs_profile_stop (plugin->profile, "appstream::add_installed");