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Turns a 16x32 multiply into a 16x16 one in celt_preemphasis().

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -520,11 +520,11 @@

    {

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

       {

-         celt_sig x;

-         x = SHL32(inp[i], SIG_SHIFT);

+         opus_val16 x;

+         x = inp[i];

          /* Apply pre-emphasis */

-         inp[i] = x + m;

-         m = - MULT16_32_Q15(coef0, x);

+         inp[i] = SHL32(x, SIG_SHIFT) - m;

+         m = SHR32(MULT16_16(coef0, x), 15-SIG_SHIFT);

       }

    }

    *mem = m;