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[dct] fail fftw creation if size <= 0

--- a/src/spectral/dct_fftw.c

+++ b/src/spectral/dct_fftw.c

@@ -63,7 +63,9 @@

 aubio_dct_fftw_t * new_aubio_dct_fftw (uint_t size) {

   aubio_dct_fftw_t * s = AUBIO_NEW(aubio_dct_fftw_t);

-  if (!s) {

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

+    AUBIO_ERR("dct_fftw: can only create with size > 0, requested %d\n",

+        size);

     goto beach;

   }

   s->size = size;