Print both values of changing address length in sockname family syscalls

* net.c (decode_sockname): Print both user and kernel address lengths
when the value changes.
* tests/net-y-unix.c (main): Update expected output.
* tests/net-yy-unix.c (main): Likewise.
* tests/net.expected: Likewise.
diff --git a/net.c b/net.c
index 245cae9..bd11741 100644
--- a/net.c
+++ b/net.c
@@ -225,7 +225,7 @@
 		tprintf(", [%d]", ulen);
 	} else {
 		decode_sockaddr(tcp, tcp->u_arg[1], ulen > rlen ? rlen : ulen);
-		if (ulen < rlen)
+		if (ulen != rlen)
 			tprintf(", [%d->%d]", ulen, rlen);
 		else
 			tprintf(", [%d]", rlen);