ipvs: Removed unused variables

ipvs is not used in ip_vs_genl_set_cmd() or ip_vs_genl_get_cmd()

Acked-by: Julian Anastasov <ja@ssi.bg>
Acked-by Hans Schillstrom <hans@schillstrom.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>