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src/spectral/fft.c: make sure we set allocated vectors to 0

--- a/src/spectral/fft.c

+++ b/src/spectral/fft.c

@@ -83,6 +83,7 @@

 aubio_fft_t * new_aubio_fft(uint_t winsize, uint_t channels) {

   aubio_fft_t * s = AUBIO_NEW(aubio_fft_t);

+  uint_t i;

   s->winsize  = winsize;

   s->channels = channels;

   /* allocate memory */

@@ -101,6 +102,13 @@

   s->pfw = fftw_plan_r2r_1d(winsize, s->in,  s->specdata, FFTW_R2HC, FFTW_ESTIMATE);

   s->pbw = fftw_plan_r2r_1d(winsize, s->specdata, s->out, FFTW_HC2R, FFTW_ESTIMATE);

 #endif

+  for (i = 0; i < s->winsize; i++) {

+    s->in[i] = 0.;

+    s->out[i] = 0.;

+  }

+  for (i = 0; i < s->fft_size; i++) {

+    s->specdata[i] = 0.;

+  }

   return s;

 }