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[dct] fail ooura creation if size <= 0

--- a/src/spectral/dct_ooura.c

+++ b/src/spectral/dct_ooura.c

@@ -38,8 +38,8 @@

 aubio_dct_ooura_t * new_aubio_dct_ooura (uint_t size) {

   aubio_dct_ooura_t * s = AUBIO_NEW(aubio_dct_ooura_t);

-  if (aubio_is_power_of_two(size) != 1) {

-    AUBIO_ERR("dct: can only create with sizes power of two, requested %d\n",

+  if (aubio_is_power_of_two(size) != 1 || (sint_t)size <= 0) {

+    AUBIO_ERR("dct_ooura: can only create with sizes power of two, requested %d\n",

         size);

     goto beach;

   }

-- 

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