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ladspa: free memory allocated for control ports

This memory is allocated during the getopts function and
needs to be freed to avoid memory leaks in long-running
libsox-based processes.

--- a/src/ladspa.c

+++ b/src/ladspa.c

@@ -289,6 +289,15 @@

   return SOX_SUCCESS;

 }

+static int sox_ladspa_kill(sox_effect_t * effp)

+{

+  priv_t * l_st = (priv_t *)effp->priv;

+

+  free(l_st->control);

+

+  return SOX_SUCCESS;

+}

+

 static sox_effect_handler_t sox_ladspa_effect = {

   "ladspa",

   "MODULE [PLUGIN] [ARGUMENT...]",

@@ -298,7 +307,8 @@

   sox_ladspa_flow,

   sox_ladspa_drain,

   sox_ladspa_stop,

-  NULL, sizeof(priv_t)

+  sox_ladspa_kill,

+  sizeof(priv_t)

 };

 const sox_effect_handler_t *lsx_ladspa_effect_fn(void)