[gxml] libxml-2.0.vapi: fix the ctype for dump_memory_format's mem param

[Richard Hans Schwarting <rschwart src gnome org>]

commit 0aac0f8cb074b20e23690c8d52d9939ecc54306f
Author: Richard Schwarting <aquarichy gmail com>
Date:   Sat Jul 27 00:01:30 2013 -0400

    libxml-2.0.vapi: fix the ctype for dump_memory_format's mem param

 vapi/libxml-2.0.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vapi/libxml-2.0.vapi b/vapi/libxml-2.0.vapi
index ab5ff4d..9b611e4 100644
--- a/vapi/libxml-2.0.vapi
+++ b/vapi/libxml-2.0.vapi
@@ -380,7 +380,7 @@ namespace Xml {
                public int dump (GLib.FileStream f);
 
                [CCode (cname = "xmlDocDumpFormatMemory")]
-               public void dump_memory_format ([CCode (type = "xmlChar*")] out string mem, out int len = 
null, bool format = true);
+               public void dump_memory_format ([CCode (type = "xmlChar**")] out string mem, out int len = 
null, bool format = true);
 
                [CCode (cname = "xmlDocDumpFormatMemoryEnc")]
                public void dump_memory_enc_format ([CCode (type = "xmlChar**")] out string mem, out int len 
= null, string enc = "UTF-8", bool format = true);