ipvs: correctly print the memory size of ip_vs_conn_tab

[ Upstream commit eba1a872 ]

The memory size of ip_vs_conn_tab changed after we use hlist
instead of list.

Fixes: 731109e7 ("ipvs: use hlist instead of list")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>