imaptracker: update_last: simplify callers

By making it a no-op if last_uid is not defined.  This isn't a
hot code path, so the extra method dispatch isn't an issue.
It'll save some indentation/wrapping in future commits.

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/PublicInbox/IMAPTracker.pm b/lib/PublicInbox/IMAPTracker.pm
index 92f21584..be9caf76 100644
--- a/lib/PublicInbox/IMAPTracker.pm
+++ b/lib/PublicInbox/IMAPTracker.pm
@@ -49,13 +49,14 @@ SELECT uid_validity, uid FROM imap_last WHERE url = ?
 }
 
 sub update_last ($$$) {
-        my ($self, $validity, $last) = @_;
+        my ($self, $validity, $last_uid) = @_;
+        return unless defined $last_uid;
         my $sth = $self->{dbh}->prepare_cached(<<'');
 INSERT OR REPLACE INTO imap_last (url, uid_validity, uid)
 VALUES (?, ?, ?)
 
         $self->lock_acquire;
-        my $rv = $sth->execute($self->{url}, $validity, $last);
+        my $rv = $sth->execute($self->{url}, $validity, $last_uid);
         $self->lock_release;
         $rv;
 }