netlabel: remove unused parameter in netlbl_netlink_auditinfo()

loginuid/sessionid/secid have been read from 'current' instead of struct
netlink_skb_parms, the parameter 'skb' seems no longer needed.

Fixes: c53fa1ed ("netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms")
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>