Fix unused lambda capture warning.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/syncfinder.cc

@@ -210,7 +210,7 @@ SyncFinder::search_approx (vector<KeyResult>& key_results, const vector<vector<v
         {
           for (auto split_start_frames : split_vector (start_frames, 256))
             {
-              thread_pool.add_job ([this, k, sync_shift, total_frame_count, n_bands, split_start_frames,
+              thread_pool.add_job ([this, k, sync_shift, split_start_frames,
                                     &sync_bits, &wav_data, &fft_db, &have_frames, &key_results, &result_mutex]()
                 {
                   for (auto start_frame : split_start_frames)