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ladspa: call cleanup function if given

Some plugins have cleanup functions to deallocate memory after
instantiation.  This must be called after deactivate.

--- a/src/ladspa.c

+++ b/src/ladspa.c

@@ -284,6 +284,9 @@

   /* If needed, deactivate the plugin */

   if (l_st->desc->deactivate)

     l_st->desc->deactivate(l_st->handle);

+  /* If needed, cleanup memory used by the plugin */

+  if (l_st->desc->cleanup)

+    l_st->desc->cleanup(l_st->handle);

   return SOX_SUCCESS;

 }