[gnome-software] Add missing locking to gs_app_get_url()

[Kalev Lember <klember src gnome org>]

commit b81ff409f82828d44f562beaf02590bf82170942
Author: Kalev Lember <klember redhat com>
Date:   Fri Apr 12 11:43:32 2019 +0200

    Add missing locking to gs_app_get_url()
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1699269

 lib/gs-app.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/lib/gs-app.c b/lib/gs-app.c
index 0ba61a7d..ef65988a 100644
--- a/lib/gs-app.c
+++ b/lib/gs-app.c
@@ -2176,7 +2176,9 @@ const gchar *
 gs_app_get_url (GsApp *app, AsUrlKind kind)
 {
        GsAppPrivate *priv = gs_app_get_instance_private (app);
+       g_autoptr(GMutexLocker) locker = NULL;
        g_return_val_if_fail (GS_IS_APP (app), NULL);
+       locker = g_mutex_locker_new (&priv->mutex);
        return g_hash_table_lookup (priv->urls, as_url_kind_to_string (kind));
 }