[tracker] libtracker-data: Plug unlikely mem/fd leak

[Carlos Garnacho <carlosg src gnome org>]

commit e36dbad6dadc36b00f50b39fdca3f1648592e003
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Dec 26 21:02:51 2016 +0100

    libtracker-data: Plug unlikely mem/fd leak
    
    If we fail to set the DB pragmas, the TrackerDBInterface would
    be leaked altogether.

 src/libtracker-data/tracker-db-manager.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/libtracker-data/tracker-db-manager.c b/src/libtracker-data/tracker-db-manager.c
index cd3b625..3a1d021 100644
--- a/src/libtracker-data/tracker-db-manager.c
+++ b/src/libtracker-data/tracker-db-manager.c
@@ -336,6 +336,7 @@ db_interface_get (TrackerDB   type,
 
        if (internal_error) {
                g_propagate_error (error, internal_error);
+               g_object_unref (iface);
                return NULL;
        }
 
@@ -1420,10 +1421,9 @@ tracker_db_manager_get_db_interfaces (GError   **error,
 
                        if (internal_error) {
                                g_propagate_error (error, internal_error);
-                               connection = NULL;
+                               g_clear_object (&connection);
                                goto end_on_error;
                        }
-
                } else {
                        db_exec_no_reply (connection,
                                          "ATTACH '%s' as '%s'",