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src/effects/timestretch_rubberband.c: remove unused variable, erase internal vector

--- a/src/effects/timestretch_rubberband.c

+++ b/src/effects/timestretch_rubberband.c

@@ -43,7 +43,6 @@

   aubio_source_t *source;

   fvec_t *in;

-  fvec_t *zeros;

   uint_t eof;

   RubberBandState rb;

@@ -67,7 +66,6 @@

   if (samplerate == 0 ) p->samplerate = aubio_source_get_samplerate(p->source);

   p->in = new_fvec(hopsize);

-  p->zeros = new_fvec(hopsize);

   if (stretchratio <= MAX_STRETCH_RATIO && stretchratio >= MIN_STRETCH_RATIO) {

     p->stretchratio = stretchratio;

@@ -111,6 +109,7 @@

 void

 del_aubio_timestretch (aubio_timestretch_t * p)

 {

+  if (p->in) del_fvec(p->in);

   if (p->source) del_aubio_source(p->source);

   if (p->rb) {

     rubberband_delete(p->rb);