[librsvg/librsvg-2.40] rsvg_handle_dispose(): Free the libxml2 parser context

[Federico Mena Quintero <federico src gnome org>]

commit b617c1a9407e29a26a4965554a51ef3fd81193e5
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Aug 8 13:19:06 2017 -0500

    rsvg_handle_dispose(): Free the libxml2 parser context
    
    If the RsvgHandle was written to but not closed, then we'll still have
    an XML parser context at dispose time - don't leak it.
    
    Fixes the leak in https://bugzilla.gnome.org/show_bug.cgi?id=777833#c2

 rsvg-base.c    |    4 ++--
 rsvg-gobject.c |    2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/rsvg-base.c b/rsvg-base.c
index c6ded51..26bbc35 100644
--- a/rsvg-base.c
+++ b/rsvg-base.c
@@ -1888,12 +1888,12 @@ rsvg_handle_read_stream_sync (RsvgHandle   *handle,
         goto out;
     }
 
-    priv->ctxt = rsvg_free_xml_parser_and_doc (priv->ctxt);
-
     res = TRUE;
 
   out:
 
+    priv->ctxt = rsvg_free_xml_parser_and_doc (priv->ctxt);
+
     g_object_unref (stream);
 
     priv->error = NULL;
diff --git a/rsvg-gobject.c b/rsvg-gobject.c
index 888c403..9b7fdc1 100644
--- a/rsvg-gobject.c
+++ b/rsvg-gobject.c
@@ -105,6 +105,8 @@ rsvg_handle_dispose (GObject *instance)
 
     self->priv->is_disposed = TRUE;
 
+    self->priv->ctxt = rsvg_free_xml_parser_and_doc (self->priv->ctxt);
+
     g_hash_table_destroy (self->priv->entities);
     rsvg_defs_free (self->priv->defs);
     g_hash_table_destroy (self->priv->css_props);