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src/pitch/pitch.c: aubio_pitch_set_unit returns AUBIO_FAIL on fail

--- a/src/pitch/pitch.c

+++ b/src/pitch/pitch.c

@@ -232,6 +232,7 @@

 uint_t

 aubio_pitch_set_unit (aubio_pitch_t * p, char_t * pitch_unit)

 {

+  uint_t err = AUBIO_OK;

   aubio_pitch_mode pitch_mode;

   if (strcmp (pitch_unit, "freq") == 0)

     pitch_mode = aubio_pitchm_freq;

@@ -246,6 +247,7 @@

   else {

     AUBIO_ERR ("unknown pitch detection unit %s, using default\n", pitch_unit);

     pitch_mode = aubio_pitchm_default;

+    err = AUBIO_FAIL;

   }

   p->mode = pitch_mode;

   switch (p->mode) {

@@ -265,7 +267,7 @@

     default:

       break;

   }

-  return AUBIO_OK;

+  return err;

 }

 uint_t