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src/spectral/mfcc.c: move declaration up

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

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

@@ -122,6 +122,9 @@

 void

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

 {

+#ifndef HAVE_SLOW_DCT

+  fvec_t tmp;

+#endif

   /* compute filterbank */

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

@@ -138,7 +141,6 @@

   aubio_dct_do(mf->dct, mf->in_dct, mf->output);

   // copy only first n_coeffs elements

   // TODO assert mf->output->length == n_coeffs

-  fvec_t tmp;

   tmp.data = mf->output->data;

   tmp.length = out->length;

   fvec_copy(&tmp, out);