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Setting oldBandE to zero outside of [start,end[

In case start or end changes, we want the encoder and decoder
to be in sync and not do anything stupid.

--- a/libcelt/celt.c

+++ b/libcelt/celt.c

@@ -1326,6 +1326,12 @@

    st->prefilter_period = pitch_index;

    st->prefilter_gain = gain1;

+   /* In case start or end were to change */

+   for (i=0;i<st->start;i++)

+      oldBandE[i]=0;

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

+      oldBandE[i]=0;

+

    /* If there's any room left (can only happen for very high rates),

       fill it with zeros */

    while (ec_enc_tell(enc,0) + 8 <= nbCompressedBytes*8)

@@ -2048,6 +2054,12 @@

    st->postfilter_period = postfilter_pitch;

    st->postfilter_gain = postfilter_gain;

 #endif /* ENABLE_POSTFILTER */

+

+   /* In case start or end were to change */

+   for (i=0;i<st->start;i++)

+      oldBandE[i]=0;

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

+      oldBandE[i]=0;

    deemphasis(out_syn, pcm, N, C, st->mode->preemph, st->preemph_memD);

    st->loss_count = 0;