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src/spectral/mfcc.c: improve build with -Wdeclaration-after-statement

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

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

@@ -51,6 +51,7 @@

   /* allocate space for mfcc object */

   aubio_mfcc_t *mfcc = AUBIO_NEW (aubio_mfcc_t);

+  smpl_t scaling;

   uint_t i, j;

@@ -70,7 +71,7 @@

   /* compute DCT transform dct_coeffs[i][j] as

      cos ( j * (i+.5) * PI / n_filters ) */

-  smpl_t scaling = 1. / SQRT (n_filters / 2.);

+  scaling = 1. / SQRT (n_filters / 2.);

   for (i = 0; i < n_filters; i++) {

     for (j = 0; j < n_coefs; j++) {

       mfcc->dct_coeffs->data[i][j] =