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src/spectral/filterbank.c: make sure we don't read outside of boundaries

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

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

@@ -62,6 +62,7 @@

   /* apply filter to all input channel, provided out has enough channels */

   uint_t max_channels = MIN (in->channels, out->channels);

   uint_t max_filters = MIN (f->n_filters, out->length);

+  uint_t max_length = MIN (in->length, f->filters->length);

   /* reset all values in output vector */

   fvec_zeros (out);

@@ -73,7 +74,7 @@

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

       /* for each sample */

-      for (j = 0; j < in->length; j++) {

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

         out->data[i][fn] += in->norm[i][j] * f->filters->data[fn][j];

       }

     }