[dconf] dconf engine: don't leak lock table on reload

[Ryan Lortie <ryanl src gnome org>]

commit 1ce11b2802c915b7e4c9c8d7f1d2862982335406
Author: Ryan Lortie <desrt desrt ca>
Date:   Mon Mar 19 11:24:26 2012 -0400

    dconf engine: don't leak lock table on reload
    
    If the system database changes while a program is running make sure we
    unref the old copy of the lock table (if it exists) before trying to
    load the new one.

 engine/dconf-engine.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/engine/dconf-engine.c b/engine/dconf-engine.c
index 6f5c2af..aedabcf 100644
--- a/engine/dconf-engine.c
+++ b/engine/dconf-engine.c
@@ -169,6 +169,12 @@ dconf_engine_refresh_system (DConfEngine *engine,
 {
   if (engine->gvdbs[i] && !gvdb_table_is_valid (engine->gvdbs[i]))
     {
+      if (engine->lock_tables[i])
+        {
+          gvdb_table_unref (engine->lock_tables[i]);
+          engine->lock_tables[i] = NULL;
+        }
+
       gvdb_table_unref (engine->gvdbs[i]);
       engine->gvdbs[i] = NULL;
     }