[tracker-miners/tracker-miners-2.3: 1/2] tracker-extract-vorbis: add null protection for g_object_unref

[Sam Thursfield <sthursfield src gnome org>]

commit 5729a5647262a412d95abe302df0c81dbf5a983f
Author: Pekka Vuorela <pekka vuorela jolla com>
Date:   Wed May 27 18:13:30 2020 +0300

    tracker-extract-vorbis: add null protection for g_object_unref

 src/tracker-extract/tracker-extract-vorbis.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-vorbis.c b/src/tracker-extract/tracker-extract-vorbis.c
index 6a4df3bae..92475342f 100644
--- a/src/tracker-extract/tracker-extract-vorbis.c
+++ b/src/tracker-extract/tracker-extract-vorbis.c
@@ -239,8 +239,10 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                tracker_resource_set_relation (metadata, "nmm:musicAlbumDisc", album_disc);
 
                g_object_unref (album_disc);
-               g_object_unref (mb_release_id);
-               g_object_unref (mb_release_group_id);
+               if (mb_release_id)
+                       g_object_unref (mb_release_id);
+               if (mb_release_group_id)
+                       g_object_unref (mb_release_group_id);
        }
 
        g_free (vd.track_count);