compat: ipv4: Pass struct net into ip_defrag.

compat: ipv4: Pass struct net into ip_defrag.

Upstream commit:
    ipv4: Pass struct net into ip_defrag and ip_check_defrag

    The function ip_defrag is called on both the input and the output
    paths of the networking stack.  In particular conntrack when it is
    tracking outbound packets from the local machine calls ip_defrag.

    So add a struct net parameter and stop making ip_defrag guess which
    network namespace it needs to defragment packets in.

    Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
    Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
Upstream: 19bcf9f203c8 ("ipv4: Pass struct net into ip_defrag and ip_check_defrag")
Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Jesse Gross <jesse@kernel.org>