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post-filter saturation

--- a/celt/celt.c

+++ b/celt/celt.c

@@ -236,11 +236,20 @@

       /* OPT: Happens to work without the OPUS_MOVE(), but only because the current encoder already copies x to y */

       if (x!=y)

          OPUS_MOVE(y+overlap, x+overlap, N-overlap);

+#ifdef FIXED_POINT

+      for (i=0; i < overlap; i++)

+         y[i] = SATURATE(y[i], SIG_SAT);

+#endif

       return;

    }

    /* Compute the part with the constant filter. */

    comb_filter_const(y+i, x+i, T1, N-i, g10, g11, g12, arch);

+#ifdef FIXED_POINT

+   for (i=0; i < N; i++)

+      y[i] = SATURATE(y[i], SIG_SAT);

+#endif

+

 }

 #endif /* OVERRIDE_comb_filter */