inbox: do not waste hash slot on httpbackend_limiter

A few dozen bytes saved here can add up when we have thousands
of inboxes.  It also makes Data::Dumper debug output a bit cleaner.

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index 6cd20ec0..20f8c884 100644
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -126,11 +126,12 @@ sub version {
 
 sub git_epoch {
         my ($self, $epoch) = @_; # v2-only, callers always supply $epoch
-        $self->{"$epoch.git"} ||= do {
+        $self->{"$epoch.git"} //= do {
                 my $git_dir = "$self->{inboxdir}/git/$epoch.git";
                 return unless -d $git_dir;
                 my $g = PublicInbox::Git->new($git_dir);
-                $g->{-httpbackend_limiter} = $self->{-httpbackend_limiter};
+                my $lim = $self->{-httpbackend_limiter};
+                $g->{-httpbackend_limiter} = $lim if $lim;
                 # caller must manually cleanup when done
                 $g;
         };
@@ -138,11 +139,12 @@ sub git_epoch {
 
 sub git {
         my ($self) = @_;
-        $self->{git} ||= do {
+        $self->{git} //= do {
                 my $git_dir = $self->{inboxdir};
                 $git_dir .= '/all.git' if $self->version == 2;
                 my $g = PublicInbox::Git->new($git_dir);
-                $g->{-httpbackend_limiter} = $self->{-httpbackend_limiter};
+                my $lim = $self->{-httpbackend_limiter};
+                $g->{-httpbackend_limiter} = $lim if $lim;
                 _cleanup_later($self);
                 $g;
         };