crypto_pr_reqid
extern int crypto_pr_reqid(uintptr_t, reqid_data_t *, reqid_cb_data_t *);
wsp->walk_callback = (mdb_walk_cb_t)crypto_pr_reqid;
status = mdb_pwalk("kcf_reqid_table", (mdb_walk_cb_t)crypto_pr_reqid,
crypto_pr_reqid(addr, &wdata, &cbdata);