Fixed _log_open_tag to remove namespace prefix with libexpat

src/parser_libxml2.c

@@ -238,6 +238,11 @@ parser_t *parser_new(xmpp_ctx_t *ctx,
     return parser;
 }
 
+char* parser_attr_name(xmpp_ctx_t *ctx, char *nsname)
+{
+    return xmpp_strdup(ctx, nsname);
+}
+
 /* free a parser */
 void parser_free(parser_t *parser)
 {