[json-glib] Quell a compiler warning

[Emmanuele Bassi <ebassi src gnome org>]

commit e6ee5b974d7e1530818229b4b9da20ea3dfec91c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Mar 13 12:27:38 2017 +0000

    Quell a compiler warning
    
    Original patch by: Thibault Saunier <tsaunier gnome org>

 json-glib/json-gvariant.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/json-glib/json-gvariant.c b/json-glib/json-gvariant.c
index 061c284..afa6405 100644
--- a/json-glib/json-gvariant.c
+++ b/json-glib/json-gvariant.c
@@ -761,7 +761,7 @@ json_to_gvariant_array (JsonNode     *json_node,
   JsonArray *array;
   GList *children = NULL;
   gboolean roll_back = FALSE;
-  const gchar *orig_signature;
+  const gchar *orig_signature = NULL;
   gchar *child_signature;
 
   array = json_node_get_array (json_node);