lavfi/af_sofalizer: remove exp2 and replace clz by ff_clz
ff_clz is faster, and uses an intrinsic (at the moment on GCC). exp2 is a wasteful function for a simple integer exponentiation. Untested. Reviewed-by: NPaul B Mahol <onemda@gmail.com> Signed-off-by: NGanesh Ajjanagadde <gajjanagadde@gmail.com>
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