ceph_crc32 null buffer

["Liu, Changcheng" <changcheng.liu@xxxxxxxxx>]

Hi all,
    Does anyone know that why Ceph needs to calcualate the crc of "null"
    buffer?
    There's below code in Ceph:
        ceph_crc32c(rand(), nullptr, size);
        https://github.com/ceph/ceph/blob/master/src/test/common/test_crc32c.cc#L358

    For the "null" buffer case, doesn't Ceph think to be all zero value
    to calculate the crc value?

B.R.
Changcheng
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