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stereo allocator tuning

--- a/libcelt/rate.c

+++ b/libcelt/rate.c

@@ -145,10 +145,14 @@

       int offset;

       N=m->eBands[j+1]-m->eBands[j]; 

-      d=C*N<<BITRES; 

+      /* Compensate for the extra DoF in stereo */

+      d=(C*N+ ((C==2 && N>2) ? 1 : 0))<<BITRES; 

       offset = FINE_OFFSET - log2_frac(N, BITRES);

       /* Offset for the number of fine bits compared to their "fair share" of total/N */

       offset = bits[j]-offset*N*C;

+      /* Compensate for the prediction gain in stereo */

+      if (C==2)

+         offset -= 1<<BITRES;

       if (offset < 0)

          offset = 0;

       ebits[j] = (2*offset+d)/(2*d);