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>
add_conjunction(struct ofpbuf *out,
                uint32_t id, uint8_t clause, uint8_t n_clauses)
{
    struct ofpact_conjunction *oc;

    oc = ofpact_put_CONJUNCTION(out);
    oc->id = id;
    oc->clause = clause;
    oc->n_clauses = n_clauses;
}

add_conjunction(struct ofpbuf *out,
                uint32_t id, uint8_t clause, uint8_t n_clauses)
{
    struct ofpact_conjunction *oc;

    oc = ofpact_put_CONJUNCTION(out);
    oc->id = id;
    oc->clause = clause;
    oc->n_clauses = n_clauses;
}
