host-utils: Simplify pow2ceil()

    return 0x8000000000000000ull >> clz64(value);

}

/* round up to the nearest power of 2 (0 if overflow) */

/*

 * Return @value rounded up to the nearest power of two modulo 2^64.

 * This is *zero* for @value > 2^63, so be careful.

 */

static inline uint64_t pow2ceil(uint64_t value)

{

    uint8_t nlz = clz64(value);

    int n = clz64(value - 1);

    if (is_power_of_2(value)) {

        return value;

    }

    if (!nlz) {

        return 0;

    if (!n) {

        /*

         * @value - 1 has no leading zeroes, thus @value - 1 >= 2^63

         * Therefore, either @value == 0 or @value > 2^63.

         * If it's 0, return 1, else return 0.

         */

        return !value;

    }

    return 1ULL << (64 - nlz);

    return 0x8000000000000000ull >> (n - 1);

}

/**