nntp: fix XOVER command

Oops, we need to test commands more closely :x
Add a missing prototype while we're at it for extra
checking.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 6dc0db35..0d0de976 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -762,11 +762,11 @@ sub cmd_xrover ($;$) {
         });
 }
 
-sub over_line {
+sub over_line ($$) {
         my ($self, $r) = @_;
 
         more($self, join("\t", $r->[0], map {
-                                my $h = xhdr($r, $_);
+                                my $h = hdr_val($r, $_);
                                 defined $h ? $h : '';
                         } @OVERVIEW ));
 }