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This fixes a bug in the new stereo code triggered only at ridiculously high
bitrates. It was caused by excessive "balance" bits leading to qb>14.

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -610,6 +610,8 @@

          qb = (b>>BITRES)-1;

       if (qb<0)

          qb = 0;

+      if (qb>14)

+         qb = 14;

       if (qb==0)

          point_stereo_mix(m, X, bandE, i, 1);

@@ -963,6 +965,8 @@

       qb = (b-2*(N-1)*(40-log2_frac(N,4)))/(32*(N-1));

       if (qb > (b>>BITRES)-1)

          qb = (b>>BITRES)-1;

+      if (qb>14)

+         qb = 14;

       if (qb<0)

          qb = 0;

       qalloc = log2_frac((1<<qb)+1,4);