s3lifecycle: guard ShouldExpireNoncurrentVersion against zero SuccessorModTime

Add early return when obj.IsLatest or obj.SuccessorModTime.IsZero()
to prevent premature expiration of versions with uninitialized
successor timestamps (zero value would compute to epoch, always expired).

weed/s3api/s3lifecycle/evaluator.go

@@ -73,6 +73,9 @@ func ShouldExpireNoncurrentVersion(rule Rule, obj ObjectInfo, noncurrentIndex in
 	if rule.NoncurrentVersionExpirationDays <= 0 {
 		return false
 	}
+	if obj.IsLatest || obj.SuccessorModTime.IsZero() {
+		return false
+	}
 	if !matchesFilter(rule, obj) {
 		return false
 	}