searchidx: use defined for checking EOF behavior

While empty or "0" should never appear, this allows the
reviewer to think and know less about the context in which
this check is done.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 67272997..1d0d926f 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -337,7 +337,7 @@ sub rlog {
                                 --raw -r --no-abbrev/, $range);
         my $latest;
         my $bytes;
-        while (my $line = <$log>) {
+        while (defined(my $line = <$log>)) {
                 if ($line =~ /$addmsg/o) {
                         my $mime = do_cat_mail($git, $1, \$bytes) or next;
                         $add_cb->($self, $git, $mime, $bytes);