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Using celt_inner_prod() in compute_band_energies()

--- a/celt/bands.c

+++ b/celt/bands.c

@@ -158,10 +158,8 @@

    c=0; do {

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

       {

-         int j;

-         opus_val32 sum = 1e-27f;

-         for (j=M*eBands[i];j<M*eBands[i+1];j++)

-            sum += X[j+c*N]*X[j+c*N];

+         opus_val32 sum;

+         sum = 1e-27f + celt_inner_prod(&X[c*N+M*eBands[i]], &X[c*N+M*eBands[i]], M*(eBands[i+1]-eBands[i]));

          bandE[i+c*m->nbEBands] = celt_sqrt(sum);

          /*printf ("%f ", bandE[i+c*m->nbEBands]);*/

       }