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[tests] prevent crash in test-awhitening, fix memory leaks

--- a/tests/src/spectral/test-awhitening.c

+++ b/tests/src/spectral/test-awhitening.c

@@ -41,9 +41,11 @@

   if (!o) { err = 1; goto beach_sink; }

   aubio_pvoc_t *pv = new_aubio_pvoc(win_size, hop_size);

+  if (!pv) { err = 1; goto beach_pvoc; }

   aubio_spectral_whitening_t *awhitening =

     new_aubio_spectral_whitening (win_size, hop_size, samplerate);

+  if (!awhitening) { err = 1; goto beach_awhitening; }

   aubio_spectral_whitening_set_relax_time(awhitening, 20.);

   fvec_set_all(scale, 3.);

@@ -71,11 +73,18 @@

       n_frames, samplerate, n_frames / hop_size,

       source_path, sink_path);

+  del_aubio_spectral_whitening(awhitening);

+beach_awhitening:

+  del_aubio_pvoc(pv);

+beach_pvoc:

   del_aubio_sink(o);

 beach_sink:

   del_aubio_source(i);

 beach_source:

   del_fvec(vec);

+  del_fvec(out);

+  del_fvec(scale);

+  del_cvec(fftgrain);

 beach_fvec:

   return err;

 }