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examples/aubiopitch.c: synth only when need be

--- a/examples/aubiopitch.c

+++ b/examples/aubiopitch.c

@@ -30,12 +30,12 @@

 void

 process_block(fvec_t * ibuf, fvec_t * obuf) {

-  fvec_zeros(obuf);

   aubio_pitch_do (o, ibuf, pitch);

+  if ( !usejack && ! sink_uri ) return;

+  fvec_zeros(obuf);

   smpl_t freq = fvec_get_sample(pitch, 0);

   aubio_wavetable_set_amp ( wavetable, aubio_level_lin (ibuf) );

   aubio_wavetable_set_freq ( wavetable, freq );

-

   if (mix_input)

     aubio_wavetable_do (wavetable, ibuf, obuf);

   else