[gtk+] label: Plug a memory leak

[Matthias Clasen <matthiasc src gnome org>]

commit 98da7730eacb9582403cb2b3a57aab677de5f4f0
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 4 22:24:43 2018 -0500

    label: Plug a memory leak
    
    We were sometimes leaking the content serializer object.

 gtk/gtklabel.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index 8dfd6bd..102f199 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -3216,6 +3216,7 @@ gtk_label_finalize (GObject *object)
       g_object_unref (priv->select_info->drag_gesture);
       g_object_unref (priv->select_info->multipress_gesture);
       g_object_unref (priv->select_info->motion_controller);
+      g_object_unref (priv->select_info->provider);
     }
 
   gtk_label_clear_links (label);