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[dct] fix radix check for accelerate

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

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

@@ -87,7 +87,7 @@

   {

     uint_t radix = size;

     uint_t order = 0;

-    while ((radix / 2) * 2 == radix) {

+    while ((radix >= 1) && ((radix / 2) * 2 == radix)) {

       radix /= 2;

       order++;

     }