[librsvg] Make RsvgHandle:dispose safe to be called multiple times

[Christian Persch <chpe src gnome org>]

commit ddbb72cbeebd597a7bf143a6ba7bc448feac3372
Author: Christian Persch <chpe gnome org>
Date:   Wed Sep 7 12:24:21 2011 +0200

    Make RsvgHandle:dispose safe to be called multiple times

 rsvg-gobject.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/rsvg-gobject.c b/rsvg-gobject.c
index eaea0cd..3b158a5 100644
--- a/rsvg-gobject.c
+++ b/rsvg-gobject.c
@@ -116,6 +116,9 @@ instance_dispose (GObject * instance)
 {
     RsvgHandle *self = (RsvgHandle *) instance;
 
+    if (self->priv->is_disposed)
+      goto chain;
+
     self->priv->is_disposed = TRUE;
 
     g_hash_table_foreach (self->priv->entities, rsvg_ctx_free_helper, NULL);
@@ -151,6 +154,7 @@ instance_dispose (GObject * instance)
     }
 #endif
 
+  chain:
     rsvg_parent_class->dispose (instance);
 }