reduce copies by passing string refs to Email::MIME

This should reduce data copies and memory usage, according
to Email::Simple documentation.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/Feed.pm b/lib/PublicInbox/Feed.pm
index a507cda1..09eb2fca 100644
--- a/lib/PublicInbox/Feed.pm
+++ b/lib/PublicInbox/Feed.pm
@@ -299,7 +299,7 @@ sub dump_html_line {
 sub do_cat_mail {
         my ($git, $path) = @_;
         my $str = $git->cat_file("HEAD:$path");
-        Email::MIME->new($$str);
+        Email::MIME->new($str);
 }
 
 1;