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[filterbank] move statement after declaration

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

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

@@ -172,11 +172,6 @@

 {

   uint_t retval;

-  if (samplerate <= 0) {

-    AUBIO_ERR("filterbank: set_mel_coeffs_slaney samplerate should be > 0\n");

-    return AUBIO_FAIL;

-  }

-

   /* Malcolm Slaney parameters */

   smpl_t lowestFrequency = 133.3333;

   smpl_t linearSpacing = 66.66666666;

@@ -191,7 +186,14 @@

   smpl_t lastlinearCF;

   /* buffers to compute filter frequencies */

-  fvec_t *freqs = new_fvec (n_filters + 2);

+  fvec_t *freqs;

+

+  if (samplerate <= 0) {

+    AUBIO_ERR("filterbank: set_mel_coeffs_slaney samplerate should be > 0\n");

+    return AUBIO_FAIL;

+  }

+

+  freqs = new_fvec (n_filters + 2);

   /* first step: fill all the linear filter frequencies */

   for (fn = 0; fn < linearFilters; fn++) {