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Check for underflow in the debug USUB32.

--- a/celt/fixed_debug.h

+++ b/celt/fixed_debug.h

@@ -271,6 +271,10 @@

    {

       fprintf (stderr, "USUB32: inputs are not uint32: %llu %llu in %s: line %d\n", a, b, file, line);

    }

+   if (a<b)

+   {

+      fprintf (stderr, "USUB32: inputs underflow: %llu < %llu in %s: line %d\n", a, b, file, line);

+   }

    res = a-b;

    if (!VERIFY_UINT(res))

    {