my ($self) = @_;
$cleanup_avail = cleanup_possible() if $cleanup_avail < 0;
return if $cleanup_avail != 1;
- $cleanup_timer ||= PublicInbox::DS::later(*cleanup_task);
+ $cleanup_timer //= PublicInbox::DS::later(\&cleanup_task);
$CLEANUP->{"$self"} = $self;
}