[gnome-software] trivial: Fix the build

[Kalev Lember <klember src gnome org>]

commit d101eb4ee20cdf00a15db19ebab41554fa68c7d9
Author: Kalev Lember <klember redhat com>
Date:   Thu Dec 29 15:49:06 2016 +0100

    trivial: Fix the build

 src/gs-plugin.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-plugin.c b/src/gs-plugin.c
index e88ace6..eebe777 100644
--- a/src/gs-plugin.c
+++ b/src/gs-plugin.c
@@ -437,7 +437,7 @@ gs_plugin_get_appstream_id (GsPlugin *plugin)
  *
  * Since: 3.24
  **/
-const void
+void
 gs_plugin_set_appstream_id (GsPlugin *plugin, const gchar *appstream_id)
 {
        GsPluginPrivate *priv = gs_plugin_get_instance_private (plugin);