fib: use __fls() on non null argument
__fls(x) is a bit faster than fls(x), granted we know x is non null. As Ben Hutchings pointed out, fls(x) = __fls(x) + 1 Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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