[libxml2] Remove a few warnings

[Daniel Veillard <veillard src gnome org>]

commit 06c93b75095ddca6ba80e45dd381bb69cd04b9f6
Author: Daniel Veillard <veillard redhat com>
Date:   Mon Mar 15 16:08:44 2010 +0100

    Remove a few warnings

 HTMLparser.c |    2 --
 SAX2.c       |    3 ++-
 xinclude.c   |    1 -
 3 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/HTMLparser.c b/HTMLparser.c
index 3e2467c..42dc776 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -4291,8 +4291,6 @@ htmlParseElementInternal(htmlParserCtxtPtr ctxt) {
     const htmlElemDesc * info;
     htmlParserNodeInfo node_info;
     int failed;
-    int depth;
-    const xmlChar *oldptr;
 
     if ((ctxt == NULL) || (ctxt->input == NULL)) {
 	htmlParseErr(ctxt, XML_ERR_INTERNAL_ERROR,
diff --git a/SAX2.c b/SAX2.c
index 04c0e30..84c1f00 100644
--- a/SAX2.c
+++ b/SAX2.c
@@ -1108,7 +1108,8 @@ xmlSAX2AttributeInternal(void *ctx, const xmlChar *fullname,
 #ifdef LIBXML_HTML_ENABLED
     if ((ctxt->html) &&
         (value == NULL) && (htmlIsBooleanAttr(fullname))) {
-            nval = value = xmlStrdup(fullname);
+            nval = xmlStrdup(fullname);
+            value = (const xmlChar *) nval;
     } else
 #endif
     {
diff --git a/xinclude.c b/xinclude.c
index 674db9c..2916ffa 100644
--- a/xinclude.c
+++ b/xinclude.c
@@ -2479,7 +2479,6 @@ xmlXIncludeProcessTreeFlagsData(xmlNodePtr tree, int flags, void *data) {
  */
 int
 xmlXIncludeProcessFlagsData(xmlDocPtr doc, int flags, void *data) {
-    xmlXIncludeCtxtPtr ctxt;
     xmlNodePtr tree;
 
     if (doc == NULL)