[tracker-miners/tracker-miners-2.3: 1/5] miners/fs: Avoid possible NULL pointer reference

[Sam Thursfield <sthursfield src gnome org>]

commit e4d5383da59b3198a7156c9c344ded4e0fbe04d5
Author: Sam Thursfield <sam afuera me uk>
Date:   Sun Dec 1 21:41:14 2019 +0100

    miners/fs: Avoid possible NULL pointer reference
    
    If we hit an issue during miner_files_initable_init() then the
    extract_watchdog instance may never be created.

 src/miners/fs/tracker-miner-files.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/src/miners/fs/tracker-miner-files.c b/src/miners/fs/tracker-miner-files.c
index 7d7c1d97e..52dbf25ce 100644
--- a/src/miners/fs/tracker-miner-files.c
+++ b/src/miners/fs/tracker-miner-files.c
@@ -907,10 +907,12 @@ miner_files_finalize (GObject *object)
                priv->grace_period_timeout_id = 0;
        }
 
-       g_signal_handlers_disconnect_by_func (priv->extract_watchdog,
-                                             on_extractor_lost,
-                                             NULL);
-       g_clear_object (&priv->extract_watchdog);
+       if (priv->extract_watchdog) {
+               g_signal_handlers_disconnect_by_func (priv->extract_watchdog,
+                                                     on_extractor_lost,
+                                                     NULL);
+               g_clear_object (&priv->extract_watchdog);
+       }
 
        if (priv->config) {
                g_signal_handlers_disconnect_by_func (priv->config,