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[filterbank] validate input parameters

--- a/src/spectral/filterbank.c

+++ b/src/spectral/filterbank.c

@@ -42,6 +42,15 @@

 {

   /* allocate space for filterbank object */

   aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t);

+

+  if ((sint_t)n_filters <= 0) {

+    AUBIO_ERR("filterbank: n_filters should be > 0, got %d\n", n_filters);

+    goto fail;

+  }

+  if ((sint_t)win_s <= 0) {

+    AUBIO_ERR("filterbank: win_s should be > 0, got %d\n", win_s);

+    goto fail;

+  }

   fb->win_s = win_s;

   fb->n_filters = n_filters;

@@ -53,6 +62,9 @@

   fb->power = 1;

   return fb;

+fail:

+  AUBIO_FREE (fb);

+  return NULL;

 }

 void