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[tests] fix input size in test-mfcc

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

+++ b/tests/src/spectral/test-mfcc.c

@@ -33,9 +33,9 @@

   aubio_pvoc_t *pv = 0;

   aubio_mfcc_t *mfcc = 0;

-  fvec_t *in = new_fvec (win_s); // input buffer

-  cvec_t *fftgrain = new_cvec (win_s); // input buffer

-  fvec_t *out = new_fvec (n_coeffs); // output coefficients

+  fvec_t *in = new_fvec (hop_s);       // phase vocoder input

+  cvec_t *fftgrain = new_cvec (win_s); // pvoc output / mfcc input

+  fvec_t *out = new_fvec (n_coeffs);   // mfcc output

   if (!in || !fftgrain || !out) { err = 1; goto failure; }