AUDIT: Remove stray declaration of tsk from audit_receive_msg().

It's not used any more.
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

kernel/audit.c

@@ -372,7 +372,6 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 	u16			msg_type = nlh->nlmsg_type;
 	uid_t			loginuid; /* loginuid of sender */
 	struct audit_sig_info   sig_data;
-	struct task_struct *tsk;
 
 	err = audit_netlink_ok(NETLINK_CB(skb).eff_cap, msg_type);
 	if (err)