rewriting the header for packets originating from the bridge is unncessary since we check for incoming frames destined to any of the bridged interfaces.  Also change the full mbuf copy to a referenced copy.
rewriting the header for packets originating from the bridge is
unncessary since we check for incoming frames destined to any
of the bridged interfaces.  Also change the full mbuf copy to a
referenced copy.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars