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Preventing ridiculous bit depths > 16 bit/sample

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -895,6 +895,7 @@

    int spread;

    celt_norm *lowband;

    int update_lowband = 1;

+   int C = _Y != NULL ? 2 : 1;

    SAVE_STACK;

    M = 1<<LM;

@@ -935,6 +936,9 @@

       b = IMIN(remaining_bits+1,pulses[i]+curr_balance);

       if (b<0)

          b = 0;

+      /* Prevents ridiculous bit depths */

+      if (b > C*16*N<<BITRES)

+         b = C*16*N<<BITRES;

       if (M*eBands[i]-N >= M*eBands[start])

       {