[tracker] extract/gupnp: Fix warning if no GST tags were found at all

[Carlos Garnacho <carlosg src gnome org>]

commit 89344cfaa96380628c95c9074e84860a09adb491
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu May 5 16:48:50 2011 +0200

    extract/gupnp: Fix warning if no GST tags were found at all

 src/tracker-extract/tracker-extract-gupnp-dlna.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-gupnp-dlna.c b/src/tracker-extract/tracker-extract-gupnp-dlna.c
index fc2f093..db8aef4 100644
--- a/src/tracker-extract/tracker-extract-gupnp-dlna.c
+++ b/src/tracker-extract/tracker-extract-gupnp-dlna.c
@@ -816,7 +816,9 @@ extract_gupnp_dlna (const gchar          *uri,
 
 		extract_metadata (&extractor, uri, preupdate, metadata, &artist, &album, &scount);
 
-		gst_tag_list_free (extractor.tags);
+		if (extractor.tags) {
+			gst_tag_list_free (extractor.tags);
+		}
 		gst_discoverer_stream_info_list_free (streams);
 		g_free (artist);
 		g_free (album);