esm_sensor
TAILQ_ENTRY(esm_sensor) es_entry;
TAILQ_HEAD(, esm_sensor) sc_sensors;
struct esm_sensor *sc_nextsensor;
struct esm_sensor *);
struct esm_sensor *es = sc->sc_nextsensor;
struct esm_sensor *es;
es = malloc(sizeof(struct esm_sensor), M_DEVBUF,
struct esm_sensor *es)