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filterbank.c: make sure we never write out of input/output vectors in aubio_filterbank_do

--- a/src/filterbank.c

+++ b/src/filterbank.c

@@ -169,9 +169,10 @@

 void aubio_filterbank_do(aubio_filterbank_t * f, cvec_t * in, fvec_t *out) {

   uint_t n, filter_cnt;

-  for(filter_cnt = 0; filter_cnt < f->n_filters; filter_cnt++){

+  for(filter_cnt = 0; (filter_cnt < f->n_filters)

+    && (filter_cnt < out->length); filter_cnt++){

       out->data[0][filter_cnt] = 0.f;

-      for(n = 0; n < f->win_s; n++){

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

           out->data[0][filter_cnt] += in->norm[0][n] 

             * f->filters[filter_cnt]->data[0][n];

       }

-- 

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