iproute2: Support 20-byte link layer address in idxmap

Extend the link-layer address field from 8 to 20 bytes to support InfiniBand.
Signed-off-by: David Ward <david.ward@ll.mit.edu>

lib/ll_map.c

@@ -31,7 +31,7 @@ struct idxmap
 	int		type;
 	int		alen;
 	unsigned	flags;
-	unsigned char	addr[8];
+	unsigned char	addr[20];
 	char		name[16];
 };