[tracker] libtracker-sparql: Plug TrackerNotifier leak

[Carlos Garnacho <carlosg src gnome org>]

commit b3f96d39f67f843211c1bcc2527727cd6ee48c7d
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Nov 27 19:51:57 2016 +0100

    libtracker-sparql: Plug TrackerNotifier leak
    
    The GString used to build the query is being leaked.

 src/libtracker-sparql/tracker-notifier.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-sparql/tracker-notifier.c b/src/libtracker-sparql/tracker-notifier.c
index 38e5fce..e448e79 100644
--- a/src/libtracker-sparql/tracker-notifier.c
+++ b/src/libtracker-sparql/tracker-notifier.c
@@ -660,6 +660,8 @@ expand_class_iris (TrackerNotifier  *notifier,
 
        cursor = tracker_sparql_connection_query (priv->connection, sparql->str,
                                                  cancellable, error);
+       g_string_free (sparql, TRUE);
+
        if (!cursor)
                return FALSE;
        if (!tracker_sparql_cursor_next (cursor, cancellable, error))