[json-glib] core: Optimize json_from_string() to avoid copy

[Emmanuele Bassi <ebassi src gnome org>]

commit 7d79960747b286da4608f516c575004786d1928c
Author: Ole André Vadla Ravnås <oleavr gmail com>
Date:   Tue Mar 14 18:07:14 2017 +0100

    core: Optimize json_from_string() to avoid copy
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774688

 json-glib/json-utils.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/json-glib/json-utils.c b/json-glib/json-utils.c
index 78583cd..fc92488 100644
--- a/json-glib/json-utils.c
+++ b/json-glib/json-utils.c
@@ -63,7 +63,7 @@ json_from_string (const char  *str,
       return NULL;
     }
 
-  retval = json_node_copy (json_parser_get_root (parser));
+  retval = json_parser_steal_root (parser);
 
   g_object_unref (parser);