Strict syntax for advice in error message.

diff -ruN iproute-20051007.orig/ip/ipaddress.c iproute-20051007/ip/ipaddress.c
--- iproute-20051007.orig/ip/ipaddress.c	2005-09-21 21:33:18.000000000 +0200
+++ iproute-20051007/ip/ipaddress.c	2006-03-14 07:26:26.830934712 +0100
@@ -901,7 +901,7 @@
 		return ipaddr_list_or_flush(argc-1, argv+1, 1);
 	if (matches(*argv, "help") == 0)
 		usage();
-	fprintf(stderr, "Command \"%s\" is unknown, try \"ip address help\".\n", *argv);
+	fprintf(stderr, "Command \"%s\" is unknown, try \"ip addr help\".\n", *argv);
 	exit(-1);
 }