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DRED: Fix infinite loop on "impossible" symbols

--- a/silk/dred_coding.c

+++ b/silk/dred_coding.c

@@ -77,6 +77,8 @@

         xq = x[i]*scale[i]*(1.f/256.f);

         xq = xq - delta*tanh(xq/(delta+eps));

         q = (int)floor(.5f+xq);

+        /* Make the impossible actually impossible. */

+        if (r[i] == 0 || p0[i] >= 32768) q = 0;

         ec_laplace_encode_p0(enc, q, p0[i], r[i]);

     }

 }

@@ -190,4 +192,4 @@

         printf("\n");

     }

 }

-#endif

\ No newline at end of file

+#endif

-- 

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