Patch to fix null dereference in document.writeln()

The fix recently applied to document.write() also needs to be applied
to document.writeln() This prevents a null pointer dereference.

Dave

diff --git a/javascript/duktape/Document.bnd b/javascript/duktape/Document.bnd
index 8b39ae4..1e7c49d 100644
--- a/javascript/duktape/Document.bnd
+++ b/javascript/duktape/Document.bnd
@@ -65,7 +65,9 @@ method Document::writeln()
err = dom_node_get_user_data(priv->parent.node,
corestring_dom___ns_key_html_content_data,
&htmlc);
- if (err == DOM_NO_ERR && htmlc->parser != NULL) {
+ if ((err == DOM_NO_ERR) &&
+ (htmlc != NULL) &&
+ (htmlc->parser != NULL)) {
dom_hubbub_parser_insert_chunk(htmlc->parser, (uint8_t *)text, text_len);
dom_hubbub_parser_insert_chunk(htmlc->parser, (uint8_t *)nl, SLEN(nl));
}

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