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[tests] fail dct tests if reconstruction failed

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

+++ b/tests/src/spectral/test-dct.c

@@ -32,9 +32,7 @@

     aubio_dct_do (dct, in, dctout);

     aubio_dct_rdo (dct, dctout, out);

     for (j = 0; j < in->length; j++) {

-      if (fabsf(in->data[j] - out->data[j]) > 10.e-4) {

-        fprintf(stderr, "dct reconstruction failed\n");

-      }

+      return_code += (fabsf(in->data[j] - out->data[j]) > 10.e-4);

     }

   }