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examples/aubioonset.c: avoid saturation in when using --mix-input

--- a/examples/aubioonset.c

+++ b/examples/aubioonset.c

@@ -43,10 +43,12 @@

   } else {

     aubio_wavetable_stop ( wavetable );

   }

-  if (mix_input)

+  if (mix_input) {

     aubio_wavetable_do (wavetable, ibuf, obuf);

-  else

+    fvec_clamp(obuf, 1.);

+  } else {

     aubio_wavetable_do (wavetable, obuf, obuf);

+  }

 }

 void process_print (void)