audit: eliminate audit_enabled magic number comparison

Remove comparison of audit_enabled to magic numbers outside of audit.

Related: https://github.com/linux-audit/audit-kernel/issues/86

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index 2f328af..4676f5b 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -101,7 +101,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
 	char *secctx;
 	u32 secctx_len;
 
-	if (audit_enabled == 0)
+	if (audit_enabled == AUDIT_OFF)
 		return NULL;
 
 	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);