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src/notes/notes.c: bail out if pitch creation failed (see #188)

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

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

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

   o->onset_output = new_fvec (1);

   o->pitch = new_aubio_pitch (pitch_method, o->pitch_buf_size, o->hop_size, o->samplerate);

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

   if (o->pitch_tolerance != 0.) aubio_pitch_set_tolerance (o->pitch, o->pitch_tolerance);

   aubio_pitch_set_unit (o->pitch, "midi");

   o->pitch_output = new_fvec (1);