- make the first arg of the filter function passed to rtnl_dump_filter constant

to match normal iproute. No obj-code changes.

networking/libiproute/iprule.c

@@ -40,7 +40,7 @@ static void usage(void)
 }
 */
 
-static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
+static int print_rule(const struct sockaddr_nl *who ATTRIBUTE_UNUSED,
 					struct nlmsghdr *n, void *arg ATTRIBUTE_UNUSED)
 {
 	struct rtmsg *r = NLMSG_DATA(n);