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src/synth/sampler.c: make sure blocksize > 0

--- a/src/synth/sampler.c

+++ b/src/synth/sampler.c

@@ -39,6 +39,10 @@

 aubio_sampler_t *new_aubio_sampler(uint_t samplerate, uint_t blocksize)

 {

   aubio_sampler_t *s = AUBIO_NEW(aubio_sampler_t);

+  if ((sint_t)blocksize < 1) {

+    AUBIO_ERR("sampler: got blocksize %d, but can not be < 1\n", blocksize);

+    goto beach;

+  }

   s->samplerate = samplerate;

   s->blocksize = blocksize;

   s->source_output = new_fvec(blocksize);

@@ -46,6 +50,9 @@

   s->source = NULL;

   s->playing = 0;

   return s;

+beach:

+  AUBIO_FREE(s);

+  return NULL;

 }

 uint_t aubio_sampler_load( aubio_sampler_t * o, char_t * uri )