[librsvg] Use rsvg_node_unref() to get rid of the nodes

[Federico Mena Quintero <federico src gnome org>]

commit efcbb9c933286c1b729e08df038e350923699239
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Feb 14 19:39:59 2017 -0600

    Use rsvg_node_unref() to get rid of the nodes

 rsvg-gobject.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/rsvg-gobject.c b/rsvg-gobject.c
index 611b73e..003de06 100644
--- a/rsvg-gobject.c
+++ b/rsvg-gobject.c
@@ -108,8 +108,7 @@ free_nodes (RsvgHandle *self)
         RsvgNode *node;
 
         node = g_ptr_array_index (self->priv->all_nodes, i);
-        g_assert (node->vtable->free != NULL);
-        node->vtable->free (node);
+        rsvg_node_unref (node);
     }
 
     g_ptr_array_free (self->priv->all_nodes, TRUE);