It is only used in fs/nfs/nfsroot.c, and never defined (grep -r just shows that).
I've sent Marcelo the following fix for this already.
Sorry about that.
--- fs/nfs/nfsroot.c.~2~	Fri May  3 13:56:10 2002
+++ fs/nfs/nfsroot.c	Fri May  3 13:56:30 2002
@@ -343,8 +343,8 @@
 {
 	struct sockaddr_in sin;
 
-	printk(KERN_NOTICE "Looking up port of RPC %d/%d on %s\n",
-		program, version, in_ntoa(servaddr));
+	printk(KERN_NOTICE "Looking up port of RPC %d/%d on %u.%u.%u.%u\n",
+		program, version, NIPQUAD(servaddr));
 	set_sockaddr(&sin, servaddr, 0);
 	return rpc_getport_external(&sin, program, version, proto);
 }
-
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