[librest] xml-node: Unbreak the creation of top-level nodes

[Debarshi Ray <debarshir src gnome org>]

commit 3fbcc42c10f758e52418a4302a6962bccd8c8a26
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Oct 13 19:01:02 2017 +0200

    xml-node: Unbreak the creation of top-level nodes
    
    The rest_xml_node_add_child API explicitly documents NULL parents as
    the way to create top-level nodes. This had broken the second half of
    tests/xml.c.
    
    Fallout from b11a1664cd4dfcc62b07b4a68adc220fd1eb8305
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788960

 rest/rest-xml-node.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/rest/rest-xml-node.c b/rest/rest-xml-node.c
index 03be08a..5a444ce 100644
--- a/rest/rest-xml-node.c
+++ b/rest/rest-xml-node.c
@@ -334,7 +334,6 @@ rest_xml_node_add_child (RestXmlNode *parent, const char *tag)
   RestXmlNode *node;
   char        *escaped;
 
-  g_return_val_if_fail (parent, NULL);
   g_return_val_if_fail (tag && *tag, NULL);
 
   escaped = g_markup_escape_text (tag, -1);