[gdl] fix gdl#2 GdkPixbuf g_free -> g_object_unref

[Sebastien Granjoux <sgranjoux src gnome org>]

commit 9f11ad3ca8cef85b075419b30036d73648498dfe
Author: Thomas Holder <thomas holder schrodinger com>
Date:   Fri Nov 29 11:06:33 2019 +0100

    fix gdl#2 GdkPixbuf g_free -> g_object_unref

 gdl/gdl-dock-object.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gdl/gdl-dock-object.c b/gdl/gdl-dock-object.c
index daa2c7f..e751e99 100644
--- a/gdl/gdl-dock-object.c
+++ b/gdl/gdl-dock-object.c
@@ -416,7 +416,8 @@ gdl_dock_object_finalize (GObject *g_object)
     g_free (object->priv->name);
     g_free (object->priv->long_name);
     g_free (object->priv->stock_id);
-    g_free (object->priv->pixbuf_icon);
+    if (object->priv->pixbuf_icon)
+        g_object_unref (object->priv->pixbuf_icon);
 
     G_OBJECT_CLASS (gdl_dock_object_parent_class)->finalize (g_object);
 }