[libxml2] __xmlRaiseError: fix the structured callback channel's data initialization

[Daniel Veillard <veillard src gnome org>]

commit 241d4a1069e6bedd0ee2295d7b43858109c1c6d1
Author: Dmitry V. Levin <ldv altlinux org>
Date:   Wed Feb 23 22:30:59 2011 +0800

    __xmlRaiseError: fix the structured callback channel's data initialization
    
    if we initialize the structured channel from the sax handler we should also
    pass the userData

 error.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/error.c b/error.c
index 15b431e..9c0f6bb 100644
--- a/error.c
+++ b/error.c
@@ -461,8 +461,11 @@ __xmlRaiseError(xmlStructuredErrorFunc schannel,
 	(domain == XML_FROM_IO) || (domain == XML_FROM_VALID)) {
 	ctxt = (xmlParserCtxtPtr) ctx;
 	if ((schannel == NULL) && (ctxt != NULL) && (ctxt->sax != NULL) &&
-	    (ctxt->sax->initialized == XML_SAX2_MAGIC))
+	    (ctxt->sax->initialized == XML_SAX2_MAGIC) &&
+	    (ctxt->sax->serror != NULL)) {
 	    schannel = ctxt->sax->serror;
+	    data = ctxt->userData;
+	}
     }
     /*
      * Check if structured error handler set