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src/onset/onset.c: return null and clean-up if new_aubio_specdesc failed

--- a/src/onset/onset.c

+++ b/src/onset/onset.c

@@ -205,6 +205,7 @@

   o->pv = new_aubio_pvoc(buf_size, o->hop_size);

   o->pp = new_aubio_peakpicker();

   o->od = new_aubio_specdesc(onset_mode,buf_size);

+  if (o->od == NULL) goto beach_specdesc;

   o->fftgrain = new_cvec(buf_size);

   o->desc = new_fvec(1);

@@ -219,6 +220,9 @@

   o->total_frames = 0;

   return o;

+beach_specdesc:

+  del_aubio_peakpicker(o->pp);

+  del_aubio_pvoc(o->pv);

 beach:

   AUBIO_FREE(o);

   return NULL;