[tracker/wip/carlosg/sparql1.1: 124/145] libtracker-data: Handle NULL interface on WAL thread

[Carlos Garnacho <carlosg src gnome org>]

commit fd4ba3535b8ad79382f18b8abb2e7e1977394724
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 9 16:38:14 2019 +0200

    libtracker-data: Handle NULL interface on WAL thread
    
    This is unexpected, but shouldn't cause a hard crash.

 src/libtracker-data/tracker-db-manager.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/libtracker-data/tracker-db-manager.c b/src/libtracker-data/tracker-db-manager.c
index cdb351747..e1309a135 100644
--- a/src/libtracker-data/tracker-db-manager.c
+++ b/src/libtracker-data/tracker-db-manager.c
@@ -1164,7 +1164,8 @@ wal_checkpoint_thread (gpointer data)
        if (!db_manager->db.wal_iface)
                db_manager->db.wal_iface = init_writable_db_interface (db_manager);
 
-       wal_checkpoint (db_manager->db.wal_iface, FALSE);
+       if (db_manager->db.wal_iface)
+               wal_checkpoint (db_manager->db.wal_iface, FALSE);
 
        return NULL;
 }