Fixes this build error when CONFIG_NET_NS is not set:
net/sunrpc/svcsock.c: In function 'svc_setup_socket':
net/sunrpc/svcsock.c:1412:40: error: 'struct sock_common' has no member named 'skc_net'
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
 
        /* Register socket with portmapper */
        if (*errp >= 0 && pmap_register)
-               *errp = svc_register(serv, sock->sk->sk_net, inet->sk_family,
+               *errp = svc_register(serv, sock_net(sock->sk), inet->sk_family,
                                     inet->sk_protocol,
                                     ntohs(inet_sk(inet)->inet_sport));