avcodec/ffwavesynth: Fix backward lcg_seek()
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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				@ -122,7 +122,7 @@ static void lcg_seek(uint32_t *s, int64_t dt)
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        c = LCG_C;
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    } else { /* coefficients for a step backward */
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        a = LCG_AI;
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        c = (uint32_t)(LCG_AI * LCG_C);
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        c = (uint32_t)(-LCG_AI * LCG_C);
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        dt = -dt;
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    }
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    while (dt) {
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