net/netfilter/ipset: work around gcc-4.4.4 initializer bug

net/netfilter/ipset: work around gcc-4.4.4 initializer bug

gcc-4.4.4 (at least) isn't able to handle the mixture of anonymous unions
and declaration-time intializers.  Work around this.

net/netfilter/ipset/ip_set_hash_netnet.c: In function 'hash_netnet4_uadt':
net/netfilter/ipset/ip_set_hash_netnet.c:163: error: unknown field 'cidr' specified in initializer
net/netfilter/ipset/ip_set_hash_netnet.c:163: warning: missing braces around initializer
net/netfilter/ipset/ip_set_hash_netnet.c:163: warning: (near initialization for 'e.<anonymous>.ip')
...

Fixes: ea53ac5b630e813ae ("netfilter: ipset: Add hash:net,net module to kernel.)
Cc: Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>