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src/spectral/dct_ipp.c: allow size 1

--- a/src/spectral/dct_ipp.c

+++ b/src/spectral/dct_ipp.c

@@ -67,8 +67,8 @@

   int pSpecSize, pSpecBufferSize, pBufferSize;

   IppStatus status;

-  if ((sint_t)size <= 1) {

-    AUBIO_ERR("dct: can only create with sizes greater than 1, requested %d\n",

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

+    AUBIO_ERR("dct: can only create with sizes greater than 0, requested %d\n",

         size);

     goto beach;

   }