[tracker] libtracker-data: Fix uninitialized variable usage

[Carlos Garnacho <carlosg src gnome org>]

commit 86a2bbeedeaee16c54f5ce454f34c3454c94b5a0
Author: Haithem BEN GHORBAL <haithem benghorbal gmail com>
Date:   Mon Feb 8 15:03:21 2016 +0100

    libtracker-data: Fix uninitialized variable usage
    
    object_id is not initialized in this branch of code, use the object
    URI instead.

 src/libtracker-data/tracker-data-update.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/src/libtracker-data/tracker-data-update.c b/src/libtracker-data/tracker-data-update.c
index 6f48dc9..fcf0cc5 100644
--- a/src/libtracker-data/tracker-data-update.c
+++ b/src/libtracker-data/tracker-data-update.c
@@ -3737,12 +3737,9 @@ tracker_data_replay_journal (TrackerBusyCallback   busy_callback,
                                GError *new_error = NULL;
 
                                if (object && rdf_type == property) {
-                                       TrackerClass *class = NULL;
+                                       TrackerClass *class;
 
-                                       uri = tracker_ontologies_get_uri_by_id (object_id);
-                                       if (uri) {
-                                               class = tracker_ontologies_get_class_by_uri (uri);
-                                       }
+                                       class = tracker_ontologies_get_class_by_uri (object);
                                        if (class != NULL) {
                                                cache_delete_resource_type (class, NULL, graph_id);
                                        } else {