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Fixes a fixed-point overflow by scaling pitch search more conservatively

--- a/celt/pitch.c

+++ b/celt/pitch.c

@@ -114,7 +114,7 @@

    opus_val32 maxabs = MAX32(1, celt_maxabs32(x[0], len));

    if (C==2)

       maxabs = MAX32(maxabs, celt_maxabs32(x[1], len));

-   shift = IMAX(0,celt_ilog2(maxabs)-11);

+   shift = IMAX(0,celt_ilog2(maxabs)-10);

    if (C==2)

       shift++;

 #endif