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src/mathutils.c: prevent segfault with latest Accelerate.framework (closes #58, closes #102)

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -225,10 +225,10 @@

   }

 #else

   smpl_t tmp = 0.;

-  uint_t pos = 0.;

-  aubio_vDSP_minvi(s->data, 1, &tmp, (vDSP_Length *)&pos, s->length);

+  vDSP_Length pos = 0;

+  aubio_vDSP_minvi(s->data, 1, &tmp, &pos, s->length);

 #endif

-  return pos;

+  return (uint_t)pos;

 }

 uint_t

@@ -243,10 +243,10 @@

   }

 #else

   smpl_t tmp = 0.;

-  uint_t pos = 0.;

-  aubio_vDSP_maxvi(s->data, 1, &tmp, (vDSP_Length *)&pos, s->length);

+  vDSP_Length pos = 0;

+  aubio_vDSP_maxvi(s->data, 1, &tmp, &pos, s->length);

 #endif

-  return pos;

+  return (uint_t)pos;

 }

 void