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

[Sam Thursfield <sthursfield src gnome org>]

commit bb28f2fe544d36a188a2c28f36edfbd5478b19cd
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 | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-gstreamer.c b/src/tracker-extract/tracker-extract-gstreamer.c
index af2153c44..eca6be300 100644
--- a/src/tracker-extract/tracker-extract-gstreamer.c
+++ b/src/tracker-extract/tracker-extract-gstreamer.c
@@ -628,6 +628,7 @@ extractor_apply_audio_metadata (MetadataExtractor     *extractor,
 
        #if defined GST_TAG_ACOUSTID_FINGERPRINT
                GValue acoustid_fingerprint = G_VALUE_INIT;
+               gboolean have_acoustid_fingerprint;
        #endif
 
        set_property_from_gst_tag (audio, "nmm:trackNumber", tag_list, GST_TAG_TRACK_NUMBER);
@@ -660,16 +661,16 @@ extractor_apply_audio_metadata (MetadataExtractor     *extractor,
        #endif
 
        #if defined GST_TAG_ACOUSTID_FINGERPRINT
-               gst_tag_list_copy_value (&acoustid_fingerprint, tag_list, GST_TAG_ACOUSTID_FINGERPRINT);
-               if (acoustid_fingerprint) {
+               have_acoustid_fingerprint = gst_tag_list_copy_value (&acoustid_fingerprint, tag_list, 
GST_TAG_ACOUSTID_FINGERPRINT);
+               if (have_acoustid_fingerprint) {
                        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