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src/spectral/specdesc.c: return NULL if wrong mode asked

--- a/src/spectral/specdesc.c

+++ b/src/spectral/specdesc.c

@@ -273,8 +273,9 @@

   else if (strcmp (onset_mode, "default") == 0)

       onset_type = aubio_onset_default;

   else {

-      AUBIO_ERR("unknown spectral descriptor type %s, using default.\n", onset_mode);

-      onset_type = aubio_onset_default;

+      AUBIO_ERR("unknown spectral descriptor type %s\n", onset_mode);

+      AUBIO_FREE(o);

+      return NULL;

   }

   switch(onset_type) {

     /* for both energy and hfc, only fftgrain->norm is required */