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Fix [2859842] stats effect crashes on 64-bit arch.

--- a/ChangeLog

+++ b/ChangeLog

@@ -46,6 +46,7 @@

 Effects:

   o Fix [2254919] silence doesn't trim digital silence correctly.  (robs)

+  o Fix [2859842] stats effect crashes on 64-bit arch.  (Ulrich Klauer)

 Other new features:

--- a/src/stats.c

+++ b/src/stats.c

@@ -69,7 +69,7 @@

 {

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

   size_t len = *ilen = *olen = min(*ilen, *olen);

-  memcpy(obuf, ibuf, len * sizeof(*olen));

+  memcpy(obuf, ibuf, len * sizeof(*obuf));

   for (; len--; ++ibuf, ++p->num_samples) {

     double d = SOX_SAMPLE_TO_FLOAT_64BIT(*ibuf,);