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mdct: remove unnecessary multiplication
3*n4 was already calculated in n3.
(cherry picked from commit 979395bbbb
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@ -202,7 +202,7 @@ void ff_mdct_calc_c(FFTContext *s, FFTSample *out, const FFTSample *input)
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/* pre rotation */
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for(i=0;i<n8;i++) {
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re = -input[2*i+3*n4] - input[n3-1-2*i];
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re = -input[2*i+n3] - input[n3-1-2*i];
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im = -input[n4+2*i] + input[n4-1-2*i];
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j = revtab[i];
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CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]);
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