nvf_chksum
hdrsum = nvf_chksum((char *)&hdr, sizeof (hdr));
chksum = nvf_chksum(buf, hdr.nvfh_size);
static uint16_t nvf_chksum(char *buf, int64_t buflen);
((nvf_hdr_t *)nvfbuf)->nvfh_datasum = nvf_chksum((char *)nvlbuf,
((nvf_hdr_t *)nvfbuf)->nvfh_hdrsum = nvf_chksum((char *)nvfbuf,