[tracker-miners/sam/vorbis-fix] tracker-extract-vorbis: Fix warnings from g_object_unref()

[Sam Thursfield <sthursfield src gnome org>]

commit 8bb14508e86212a38c93f606b7aca3b6223429af
Author: Sam Thursfield <sam afuera me uk>
Date:   Tue Feb 25 01:10:59 2020 +0100

    tracker-extract-vorbis: Fix warnings from g_object_unref()
    
    Fixes warnings that could happen when processing a .ogg file:
    
        (tracker-extract:54860): GLib-GObject-CRITICAL **: 00:55:14.711: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
    
        (tracker-extract:54860): GLib-GObject-CRITICAL **: 00:57:22.162: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed

 src/tracker-extract/tracker-extract-vorbis.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-vorbis.c b/src/tracker-extract/tracker-extract-vorbis.c
index 10e6ab506..fbba3076d 100644
--- a/src/tracker-extract/tracker-extract-vorbis.c
+++ b/src/tracker-extract/tracker-extract-vorbis.c
@@ -248,9 +248,9 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                tracker_resource_set_relation (metadata, "nmm:musicAlbum", album);
                tracker_resource_set_relation (metadata, "nmm:musicAlbumDisc", album_disc);
 
-               g_object_unref (album_disc);
-               g_object_unref (mb_release);
-               g_object_unref (mb_release_group);
+               g_clear_object (&album_disc);
+               g_clear_object (&mb_release);
+               g_clear_object (&mb_release_group);
        }
 
        g_free (vd.track_count);