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fixed-point: converted pitch_quant_bands() -- that one was an easy one-liner

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -208,7 +208,7 @@

    {

       int j;

       for (j=B*pBands[i];j<B*pBands[i+1];j++)

-         P[j] *= PGAIN_SCALING_1*gains[i];

+         P[j] = MULT16_16_Q15(gains[i], P[j]);

       /*printf ("%f ", gain);*/

    }

    for (i=B*pBands[m->nbPBands];i<B*pBands[m->nbPBands+1];i++)