avcodec/fft_template: improve performance of the ff_fft_init in fft_template
Before patch: init nbits = 17, get 10000 samples, average cost: 16175 us After patch: init nbits = 17, get 10000 samples, average cost: 14989 us Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
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