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Unb0rked a fixed-point regression caused in 7bb339d

--- a/libcelt/vq.c

+++ b/libcelt/vq.c

@@ -206,16 +206,17 @@

       celt_word16_t best_num = -VERY_LARGE16;

       celt_word16_t best_den = 0;

       int best_id = 0;

+      celt_word16_t magnitude = SHL16(1, yshift);

       /* The squared magnitude term gets added anyway, so we might as well 

       add it outside the loop */

-      yy = MAC16_16(yy, 1,1);

+      yy = MAC16_16(yy, magnitude,magnitude);

       j=0;

       do {

          celt_word16_t Rxy, Ryy, Ryp;

          celt_word16_t num;

          /* Select sign based on X[j] alone */

-         s = signx[j];

+         s = MULT16_16(signx[j],magnitude);

          /* Temporary sums of the new pulse(s) */

          Rxy = ROUND16(MAC16_16(xy, s,X[j]), 14);

          /* We're multiplying y[j] by two so we don't have to do it here */