Use parse_rtattr_nested

(Logical change 1.129)
diff --git a/tc/f_rsvp.c b/tc/f_rsvp.c
index 8faa22e..13fcf97 100644
--- a/tc/f_rsvp.c
+++ b/tc/f_rsvp.c
@@ -322,9 +322,7 @@
 	if (opt == NULL)
 		return 0;
 
-	memset(tb, 0, sizeof(tb));
-	if (opt)
-		parse_rtattr(tb, TCA_RSVP_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt));
+	parse_rtattr_nested(tb, TCA_RSVP_MAX, opt);
 
 	if (handle)
 		fprintf(f, "fh 0x%08x ", handle);