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Reducing the dependency chain in dc_reject()

Speeds up the encoder by about 1%

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -415,10 +415,10 @@

          x = in[channels*i+c];

          /* First stage */

          tmp = x-hp_mem[2*c];

-         hp_mem[2*c] = hp_mem[2*c] + coef*(x - hp_mem[2*c]) + VERY_SMALL;

+         hp_mem[2*c] = coef*x + VERY_SMALL - (1-coef)*hp_mem[2*c];

          /* Second stage */

          y = tmp - hp_mem[2*c+1];

-         hp_mem[2*c+1] = hp_mem[2*c+1] + coef*(tmp - hp_mem[2*c+1]) + VERY_SMALL;

+         hp_mem[2*c+1] = coef*tmp + VERY_SMALL + (1-coef)*hp_mem[2*c+1];

          out[channels*i+c] = y;

       }

    }