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src/temporal/filter.c: fix aubio_filter_do and aubio_filter_do_outplace

--- a/src/temporal/filter.c

+++ b/src/temporal/filter.c

@@ -36,11 +36,12 @@

   lvec_t * x;

 };

-void aubio_filter_do(aubio_filter_t * f, fvec_t * in) {

-  aubio_filter_do_outplace(f, in, in);

+void aubio_filter_do_outplace(aubio_filter_t * f, fvec_t * in, fvec_t * out) {

+  fvec_copy(in, out);

+  aubio_filter_do (f, out);

 }

-void aubio_filter_do_outplace(aubio_filter_t * f, fvec_t * in, fvec_t * out) {

+void aubio_filter_do(aubio_filter_t * f, fvec_t * in) {

   uint_t i,j,l, order = f->order;

   lsmp_t *x;

   lsmp_t *y;

@@ -52,18 +53,14 @@

     y = f->y->data[i];

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

       /* new input */

-      if (IS_DENORMAL(in->data[i][j])) {

-        x[0] = y[0] = 0.;

-      } else {

-        x[0] = in->data[i][j];

-        y[0] = b[0] * x[0];

-        for (l=1;l<order; l++) {

-          y[0] += b[l] * x[l];

-          y[0] -= a[l] * y[l];

-        }

+      x[0] = KILL_DENORMAL(in->data[i][j]);

+      y[0] = b[0] * x[0];

+      for (l=1;l<order; l++) {

+        y[0] += b[l] * x[l];

+        y[0] -= a[l] * y[l];

       }

       /* new output */

-      out->data[i][j] = y[0];

+      in->data[i][j] = y[0];

       /* store for next sample */

       for (l=order-1; l>0; l--){

         x[l] = x[l-1];

-- 

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