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[notes] fails if release_drop <= 0

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

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

@@ -150,7 +150,8 @@

 uint_t aubio_notes_set_release_drop(aubio_notes_t *o, smpl_t release_drop_level)

 {

   uint_t err = AUBIO_OK;

-  if (release_drop_level < 0.) {

+  if (release_drop_level <= 0.) {

+    AUBIO_ERR("notes: release_drop should be >= 0, got %f\n", release_drop_level);

     err = AUBIO_FAIL;

   } else {

     o->release_drop_level = release_drop_level;