[tracker-miners/sam/acoustid-fix] Fix confusion between GValue and string

[Sam Thursfield <sthursfield src gnome org>]

commit 56d2e17f2774bdce206183f05df5a5cccccdecd3
Author: Sam Thursfield <sam afuera me uk>
Date:   Wed Jun 24 21:13:59 2020 +0200

    Fix confusion between GValue and string
    
    This error only occurs when building against GStreamer >= 1.17
    where GST_TAG_ACOUSTID_FINGERPRINT is defined.

 src/tracker-extract/tracker-extract-gstreamer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-gstreamer.c b/src/tracker-extract/tracker-extract-gstreamer.c
index af2153c44..88f34f6e5 100644
--- a/src/tracker-extract/tracker-extract-gstreamer.c
+++ b/src/tracker-extract/tracker-extract-gstreamer.c
@@ -665,11 +665,11 @@ extractor_apply_audio_metadata (MetadataExtractor     *extractor,
                        TrackerResource *hash_resource = tracker_resource_new (NULL);
 
                        tracker_resource_set_uri (hash_resource, "rdf:type", "nfo:FileHash");
-                       tracker_resource_set_string (hash_resource, "nfo:hashValue", acoustid_fingerprint);
+                       tracker_resource_set_gvalue (hash_resource, "nfo:hashValue", acoustid_fingerprint);
                        tracker_resource_set_string (hash_resource, "nfo:hashAlgorithm", "chromaprint");
 
                        tracker_resource_add_take_relation (audio, "nfo:hasHash", hash_resource);
-                       g_free (acoustid_fingerprint);
+                       g_value_unset (acoustid_fingerprint);
                }
        #endif