[tracker/async-queries] libtracker-db: Fix NULL interface_pool unref

[Jürg Billeter <juergbi src gnome org>]

commit 7c3f8d7c6e4b9be77d009e453df98715facd5ccc
Author: Jürg Billeter <j bitron ch>
Date:   Wed Apr 14 10:25:28 2010 +0200

    libtracker-db: Fix NULL interface_pool unref

 src/libtracker-db/tracker-db-manager.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/libtracker-db/tracker-db-manager.c b/src/libtracker-db/tracker-db-manager.c
index cccf6db..9c5cb01 100644
--- a/src/libtracker-db/tracker-db-manager.c
+++ b/src/libtracker-db/tracker-db-manager.c
@@ -990,8 +990,10 @@ tracker_db_manager_shutdown (void)
 
 	g_free (in_use_filename);
 
-        g_object_unref (interface_pool);
-        interface_pool = NULL;
+	if (interface_pool) {
+		g_object_unref (interface_pool);
+		interface_pool = NULL;
+	}
 }
 
 void