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Prevents zero-energy on LFE

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1517,7 +1517,10 @@

    if (st->lfe)

    {

       for (i=2;i<st->end;i++)

+      {

          bandE[i] = IMIN(bandE[i], MULT16_32_Q15(QCONST16(1e-4f,15),bandE[0]));

+         bandE[i] = MAX32(bandE[i], EPSILON);

+      }

    }

    amp2Log2(mode, effEnd, st->end, bandE, bandLogE, C);

    if (st->energy_save)