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revert: 0 = infinite is relied upon in some cases; use trim 0 0 for 0 length output

--- a/src/synth.c

+++ b/src/synth.c

@@ -381,16 +381,6 @@

-static int flow_null(sox_effect_t * effp, const sox_sample_t * ibuf,

-    sox_sample_t * obuf, size_t * isamp, size_t * osamp)

-{

-  (void)effp, (void)ibuf, (void)obuf;

-  *isamp = *osamp = 0;

-  return SOX_EOF;

-}

-

-

-

 static int start(sox_effect_t * effp)

 {

   priv_t * p = (priv_t *)effp->priv;

@@ -398,14 +388,9 @@

   p->samples_done = 0;

-  if (p->length_str) {

+  if (p->length_str)

     if (lsx_parsesamples(effp->in_signal.rate, p->length_str, &p->samples_to_do, 't') == NULL)

       return lsx_usage(effp);

-    if (!p->samples_to_do) {

-      effp->handler.flow = flow_null;

-      return SOX_SUCCESS;

-    }

-  }

   p->number_of_channels = effp->in_signal.channels;

   p->channels = lsx_calloc(p->number_of_channels, sizeof(*p->channels));