[NETLABEL]: Compilation for CONFIG_AUDIT=n case.

The audit_log_start() will expand into an empty do { } while (0)
construction and the audit_ctx becomes unused.

The solution: push current->audit_context into audit_log_start()
directly, since it is not required in any other place in the 
calling function.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/netlabel/netlabel_user.c

@@ -96,7 +96,6 @@ int netlbl_netlink_init(void)
 struct audit_buffer *netlbl_audit_start_common(int type,
 					       struct netlbl_audit *audit_info)
 {
-	struct audit_context *audit_ctx = current->audit_context;
 	struct audit_buffer *audit_buf;
 	char *secctx;
 	u32 secctx_len;
@@ -104,7 +103,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
 	if (audit_enabled == 0)
 		return NULL;
 
-	audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type);
+	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
 	if (audit_buf == NULL)
 		return NULL;