fixed problem when XMLLINT_INDENT was empty (bug 168033). fixed

* xmlsave.c: fixed problem when XMLLINT_INDENT was empty (bug 168033).
* xpath.c: fixed compilation warning, no change to logic.
* xmlschemastypes.c: fixed compilation warning, no change to logic.
diff --git a/xmlschemastypes.c b/xmlschemastypes.c
index 13cc095..d9cc7c6 100644
--- a/xmlschemastypes.c
+++ b/xmlschemastypes.c
@@ -728,9 +728,9 @@
     if (val == NULL)
 	return (NULL);
 
-    val->value.qname.name = name;
+    val->value.qname.name = (xmlChar *)name;
     if (ns != NULL)
-	val->value.qname.uri = ns;
+	val->value.qname.uri = (xmlChar *)ns;
     return(val);
 }