git: use fields for GitCatFile

Micro-optimization, but it make using Danga::Socket for watching
pipe readability easier at some point.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/PublicInbox/GitCatFile.pm b/lib/PublicInbox/GitCatFile.pm
index 3fced28d..54036961 100644
--- a/lib/PublicInbox/GitCatFile.pm
+++ b/lib/PublicInbox/GitCatFile.pm
@@ -8,10 +8,13 @@ use strict;
 use warnings;
 use POSIX qw(dup2);
 require IO::Handle;
+use fields qw(git_dir pid in out);
 
 sub new {
         my ($class, $git_dir) = @_;
-        bless { git_dir => $git_dir }, $class;
+        my $self = fields::new($class);
+        $self->{git_dir} = $git_dir;
+        $self;
 }
 
 sub _cat_file_begin {