[PATCH 07/11] nntp: listgroup_range_i: remove useless `map' op

[Eric Wong]

No need to iterate through the array twice; and this even seems
a hair faster than what I got with commit 726d6e71aee5d974
(nntp: small speed up for multi-line responses, 2020-12-04)
---
 lib/PublicInbox/NNTP.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 43219b36..ab6eb525 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -189,7 +189,7 @@ sub listgroup_range_i {
        my ($self, $beg, $end) = @_;
        my $r = $self->{ibx}->mm(1)->msg_range($beg, $end, 'num');
        scalar(@$r) or return;
-       $self->msg_more(join('', map { "$_->[0]\r\n" } @$r));
+       $self->msg_more(join("\r\n", @$r, ''));
        1;
 }