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[tests] add calls to new_aubio_mfcc with wrong input parameters

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

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

@@ -4,13 +4,18 @@

 {

   uint_t win_s = 512; // fft size

   uint_t n_filters = 40; // number of filters

-  uint_t n_coefs = 13; // number of coefficients

+  uint_t n_coeffs = 13; // number of coefficients

   smpl_t samplerate = 16000.; // samplerate

   cvec_t *in = new_cvec (win_s); // input buffer

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

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

+  if (new_aubio_mfcc(    0, n_filters, n_coeffs, samplerate)) return 1;

+  if (new_aubio_mfcc(win_s,         0, n_coeffs, samplerate)) return 1;

+  if (new_aubio_mfcc(win_s, n_filters,        0, samplerate)) return 1;

+  if (new_aubio_mfcc(win_s, n_filters, n_coeffs,          0)) return 1;

+

   // create mfcc object

-  aubio_mfcc_t *o = new_aubio_mfcc (win_s, n_filters, n_coefs, samplerate);

+  aubio_mfcc_t *o = new_aubio_mfcc (win_s, n_filters, n_coeffs, samplerate);

   cvec_norm_set_all (in, 1.);

   aubio_mfcc_do (o, in, out);