netfilter: ipset: Prepare the kernel for create option flags when no extension is needed

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

include/linux/netfilter/ipset/ip_set.h

@@ -219,6 +219,8 @@ struct ip_set {
 	u8 revision;
 	/* Extensions */
 	u8 extensions;
+	/* Create flags */
+	u8 flags;
 	/* Default timeout value, if enabled */
 	u32 timeout;
 	/* Element data size */