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src/spectral/dct.c: ooura supports size > 1

--- a/src/spectral/dct.c

+++ b/src/spectral/dct.c

@@ -125,7 +125,7 @@

   }

 #else

   // ooura support sizes that are power of 2

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

+  if (aubio_is_power_of_two(size) != 1 || size == 1) {

     goto plain;

   }

   s->dct = (void *)new_aubio_dct_ooura (size);