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Fixes an integer wrap-around due to an exceedingly large QCONST16

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -890,7 +890,7 @@

    for (i=0;i<nbEBands;i++)

       offsets[i] = 0;

    /* Dynamic allocation code */

-   maxDepth=-QCONST16(32.f, DB_SHIFT);

+   maxDepth=-QCONST16(31.9f, DB_SHIFT);

    for (i=0;i<end;i++)

    {

       /* Noise floor must take into account eMeans, the depth, the width of the bands