L2ARC_DEV_HDR_MAGIC
if (l2dhdr.dh_magic == BSWAP_64(L2ARC_DEV_HDR_MAGIC))
if (l2dhdr.dh_magic != L2ARC_DEV_HDR_MAGIC)
if (l2dhdr->dh_magic == BSWAP_64(L2ARC_DEV_HDR_MAGIC))
if (l2dhdr->dh_magic != L2ARC_DEV_HDR_MAGIC ||
l2dhdr->dh_magic = L2ARC_DEV_HDR_MAGIC;