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[filterbank] add const qualifiers

--- a/src/spectral/filterbank_mel.c

+++ b/src/spectral/filterbank_mel.c

@@ -170,19 +170,16 @@

 aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb,

     smpl_t samplerate)

 {

-  uint_t retval;

-

   /* Malcolm Slaney parameters */

-  smpl_t lowestFrequency = 133.3333;

-  smpl_t linearSpacing = 66.66666666;

-  smpl_t logSpacing = 1.0711703;

+  const smpl_t lowestFrequency = 133.3333;

+  const smpl_t linearSpacing = 66.66666666;

+  const smpl_t logSpacing = 1.0711703;

-  uint_t linearFilters = 13;

-  uint_t logFilters = 27;

-  uint_t n_filters = linearFilters + logFilters;

+  const uint_t linearFilters = 13;

+  const uint_t logFilters = 27;

+  const uint_t n_filters = linearFilters + logFilters;

-  uint_t fn;                    /* filter counter */

-

+  uint_t fn, retval;

   smpl_t lastlinearCF;

   /* buffers to compute filter frequencies */