sysctl_remove_oid
sysctl_remove_oid(b_root, 1, 1);
sysctl_remove_oid(a_root1, 1, 1);
sysctl_remove_oid(a_root, 1, 1);
sysctl_remove_oid(ssc->sc_sysctl_ttyname, 1, 0);
sysctl_remove_oid(ssc->sc_sysctl_ttyports, 1, 0);
sysctl_remove_oid(sc->sc_sysctl_cpu[i], 1, 0);
sysctl_remove_oid(sens->oid, 1, 0);
int sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);