ip link: fix mismatched enums in vlan_parse_opt(), closes 11631

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/libiproute/iplink.c b/networking/libiproute/iplink.c
index 9c164a7..883a1f1 100644
--- a/networking/libiproute/iplink.c
+++ b/networking/libiproute/iplink.c
@@ -490,11 +490,11 @@
 	;
 	enum {
 		ARG_id = 0,
+		ARG_protocol,
 		ARG_reorder_hdr,
 		ARG_gvrp,
 		ARG_mvrp,
 		ARG_loose_binding,
-		ARG_protocol,
 	};
 	enum {
 		PROTO_8021Q = 0,