Clean up latch sequence number checks

We were checking multiple times whether it was 0.

Signed-off-by: Eugene Loh <eugene.loh@oracle.com>
Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>

libdtrace/dt_aggregate.c

@@ -421,9 +421,6 @@ dt_agg_one_agg(dt_ident_t *aid, int64_t *dst, int64_t *src, uint_t datasz)
 {
 	uint_t i, cnt;
 
-	if (*src == 0)
-		return;
-
 	switch (((dt_ident_t *)aid->di_iarg)->di_id) {
 	case DT_AGG_MAX:
 		*dst++ = *src++;	/* copy latch sequence number */
@@ -489,10 +486,6 @@ dt_aggregate_snap_one(dt_idhash_t *dhp, dt_ident_t *aid, dt_snapstate_t *st)
 		return 0;
 	}
 
-	/* not found, so skip it if latch sequence number is 0 */
-	if (*src == 0)
-		return 0;
-
 	/* add it to the hash table */
 	h = dt_zalloc(st->dtp, sizeof(dt_ahashent_t));
 	if (h == NULL)