M_NETGRAPH_PPTP
free(np, M_NETGRAPH_PPTP);
priv = malloc(sizeof(*priv), M_NETGRAPH_PPTP, M_WAITOK | M_ZERO);
hpriv = malloc(sizeof(*hpriv), M_NETGRAPH_PPTP, M_NOWAIT | M_ZERO);
free(hpriv, M_NETGRAPH_PPTP);
free(priv, M_NETGRAPH_PPTP);
free(np, M_NETGRAPH_PPTP);
static MALLOC_DEFINE(M_NETGRAPH_PPTP, "netgraph_pptp", "netgraph pptpgre node");
np = malloc(sizeof(*np), M_NETGRAPH_PPTP, M_NOWAIT | M_ZERO);