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src/synth/wavetable.c: make sure samplerate is valid

--- a/src/synth/wavetable.c

+++ b/src/synth/wavetable.c

@@ -43,6 +43,10 @@

 aubio_wavetable_t *new_aubio_wavetable(uint_t samplerate, uint_t blocksize)

 {

   aubio_wavetable_t *s = AUBIO_NEW(aubio_wavetable_t);

+  if ((sint_t)samplerate <= 0) {

+    AUBIO_ERR("Can not create wavetable with samplerate %d\n", samplerate);

+    goto beach;

+  }

   uint_t i = 0;

   s->samplerate = samplerate;

   s->blocksize = blocksize;

@@ -59,6 +63,9 @@

   s->freq = new_aubio_parameter( 0., s->samplerate / 2., 10 );

   s->amp = new_aubio_parameter( 0., 1., 100 );

   return s;

+beach:

+  AUBIO_FREE(s);

+  return NULL;

 }

 static smpl_t interp_2(fvec_t *input, smpl_t pos) {