pfil_list_find
pfh = pfil_list_find(ph->ph_in, func, arg);
pfh = pfil_list_find(ph->ph_out, func, arg);
skip_in = pfil_list_find(ph->ph_in, func, arg);
skip_out = pfil_list_find(ph->ph_out, func, arg);
pfil_list_find(const pfil_list_t *, pfil_func_t,