pf_alloc_state_key
if ((sk1 = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
if ((sk2 = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL) {
if ((skw = pf_alloc_state_key(pool_flags)) == NULL)
if ((sks = pf_alloc_state_key(pool_flags)) == NULL)
struct pf_state_key *pf_alloc_state_key(int);