ofp-actions: Avoid buffer overread in BUNDLE action decoding.

Reported-at: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9052
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Justin Pettit <jpettit@ovn.org>
parse_SET_ETH_DST(char *arg, struct ofpbuf *ofpacts,
                 enum ofputil_protocol *usable_protocols OVS_UNUSED)
{
    return str_to_mac(arg, &ofpact_put_SET_ETH_DST(ofpacts)->mac);
}

parse_SET_ETH_DST(char *arg, struct ofpbuf *ofpacts,
                 enum ofputil_protocol *usable_protocols OVS_UNUSED)
{
    return str_to_mac(arg, &ofpact_put_SET_ETH_DST(ofpacts)->mac);
}
