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-rw-r--r--lib/PublicInbox/ViewDiff.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index f7422712..3d6058a9 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -192,7 +192,7 @@ sub flush_diff ($$) {
         my ($ctx, $cur) = @_;
 
         my @top = split($EXTRACT_DIFFS, $$cur);
-        $$cur = undef;
+        undef $$cur; # free memory
 
         my $linkify = $ctx->{-linkify};
         my $dst = $ctx->{obuf};