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[notes] prevent null pointer dereference

thanks to @niugx

--- a/src/notes/notes.c

+++ b/src/notes/notes.c

@@ -83,6 +83,7 @@

   o->isready = 0;

   o->onset = new_aubio_onset (onset_method, o->onset_buf_size, o->hop_size, o->samplerate);

+  if (o->onset == NULL) goto fail;

   if (o->onset_threshold != 0.) aubio_onset_set_threshold (o->onset, o->onset_threshold);

   o->onset_output = new_fvec (1);

@@ -98,6 +99,9 @@

   }

   o->note_buffer = new_fvec(o->median);

   o->note_buffer2 = new_fvec(o->median);

+

+  if (!o->onset_output || !o->pitch_output ||

+      !o->note_buffer || !o->note_buffer2) goto fail;

   o->curnote = -1.;

   o->newnote = 0.;