http: drop unused `$env' variable after delete

And explain why we need to do that delete in a comment.

diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index b43ef8701c615ac3e86e9b56d8e960ba952e5d80..cd95f4ab74bc59a9caaa98643db372517f8fe2f6 100644 (file)
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -255,7 +255,7 @@ sub next_request ($) {
 sub response_done_cb ($$) {
        my ($self, $alive) = @_;
        sub {
-               my $env = delete $self->{env};
+               delete $self->{env}; # we're no longer busy
                $self->write(\"0\r\n\r\n") if $alive == 2;
                $self->write($alive ? \&next_request : \&close);
        }