Fix time database update calculations

The time database update math assumed that the timestamps were in
nanoseconds, but at some point in the development or review process they
changed to seconds. This PR fixes the math to use seconds instead.

Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.

Author: Paul Dagnelie

module/zfs/zfs_crrd.c

@@ -162,9 +162,9 @@ dbrrd_add(dbrrd_t *db, hrtime_t time, uint64_t txg)
 	daydiff = time - rrd_tail(&db->dbr_days);
 	monthdiff = time - rrd_tail(&db->dbr_months);
 
-	if (monthdiff >= 0 && monthdiff >= SEC2NSEC(30 * 24 * 60 * 60))
+	if (monthdiff >= 0 && monthdiff >= 30 * 24 * 60 * 60)
 		rrd_add(&db->dbr_months, time, txg);
-	else if (daydiff >= 0 && daydiff >= SEC2NSEC(24 * 60 * 60))
+	else if (daydiff >= 0 && daydiff >= 24 * 60 * 60)
 		rrd_add(&db->dbr_days, time, txg);
 	else if (minutedif >= 0)
 		rrd_add(&db->dbr_minutes, time, txg);