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src/spectral/mfcc.c: zero output before computing it

--- a/src/spectral/mfcc.c

+++ b/src/spectral/mfcc.c

@@ -97,10 +97,14 @@

 aubio_mfcc_do (aubio_mfcc_t * mf, cvec_t * in, fvec_t * out)

 {

   uint_t i, j;

+

   /* compute filterbank */

   aubio_filterbank_do (mf->fb, in, mf->in_dct);

-  /* extract real part of fft grain */

+  /* zeros output */

+  fvec_zeros(out);

+

+  /* compute discrete cosine transform */

   for (i = 0; i < mf->n_filters; i++) {

     for (j = 0; j < mf->n_coefs; j++) {

       out->data[0][j] += mf->in_dct->data[0][i]