[libxslt] Fix hang with namespace-alias, fixes #700689

[Shaun McCance <shaunm src gnome org>]

commit d20a5ab03c195870e3d27b14965d1ed6f3ae0aed
Author: Shaun McCance <shaunm gnome org>
Date:   Tue May 5 09:14:37 2015 -0400

    Fix hang with namespace-alias, fixes #700689

 libxslt/namespaces.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/libxslt/namespaces.c b/libxslt/namespaces.c
index b3c9972..07a7705 100644
--- a/libxslt/namespaces.c
+++ b/libxslt/namespaces.c
@@ -790,8 +790,10 @@ xsltCopyNamespaceList(xsltTransformContextPtr ctxt, xmlNodePtr node,
            /* TODO apply cascading */
            URI = (const xmlChar *) xmlHashLookup(ctxt->style->nsAliases,
                                                  cur->href);
-           if (URI == UNDEFINED_DEFAULT_NS)
+           if (URI == UNDEFINED_DEFAULT_NS) {
+               cur = cur->next;
                continue;
+           }
            if (URI != NULL) {
                q = xmlNewNs(node, URI, cur->prefix);
            } else {