http: simplify offset calculation slightly

No point in comparing an empty string; length() is only
potentially expensive on big strings.

diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index f65dedaae2c5a64e3935b7ef0304b4560387a7b4..f1016d2f0e139cb8460448c1d02102d0ee0ed9b9 100644 (file)
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -40,7 +40,7 @@ sub event_read { # called by Danga::Socket
 
        return event_read_input($self) if defined $self->{env};
 
-       my $off = $self->{rbuf} eq '' ? 0 : length($self->{rbuf});
+       my $off = length($self->{rbuf});
        my $r = sysread($self->{sock}, $self->{rbuf}, 8192, $off);
        if (defined $r) {
                return $self->close if $r == 0;