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src/spectral/phasevoc.c: window only once, remove unused variable

--- a/src/spectral/phasevoc.c

+++ b/src/spectral/phasevoc.c

@@ -47,14 +47,14 @@

     smpl_t * synthnew, uint_t win_s, uint_t hop_s);

 void aubio_pvoc_do(aubio_pvoc_t *pv, fvec_t * datanew, cvec_t *fftgrain) {

-  uint_t i,j;

+  uint_t i;

   for (i=0; i<pv->channels; i++) {

     /* slide  */

     aubio_pvoc_swapbuffers(pv->data->data[i],pv->dataold->data[i],

         datanew->data[i],pv->win_s,pv->hop_s);

-    /* windowing */

-    fvec_weight(pv->data, pv->w);

   }

+  /* windowing */

+  fvec_weight(pv->data, pv->w);

   /* shift */

   vec_shift(pv->data);

   /* calculate fft */