traceroute6: remove -l flag

The -l flag was used to tell traceroute6(8) to show both hostname and
address for each hop.  However, traceroute(8) already does this by
default, and there's no reason for traceroute6 to behave differently.

Make this the default behaviour, and accept -l for backward
compatibility as a no-op flag.

usr.sbin/traceroute6/traceroute6.8

@@ -120,14 +120,7 @@ tries to use routing headers.
 .It Fl I
 Use ICMP6 ECHO instead of UDP datagrams.
 .It Fl l
-Print both host hostnames and numeric addresses.
-Normally
-.Nm
-prints only hostnames if
-.Fl n
-is not specified, and only numeric addresses if
-.Fl n
-is specified.
+Ignored for backward compatibility.
 .It Fl m Ar hoplimit
 Specify maximum hoplimit, up to 255.
 The default is the value of the

usr.sbin/traceroute6/traceroute6.c

@@ -339,7 +339,6 @@ static int verbose;
 static int waittime = 5;		/* time to wait for response (in seconds) */
 static int nflag;			/* print addresses numerically */
 static int useproto = IPPROTO_UDP;	/* protocol to use to send packet */
-static int lflag;			/* print both numerical address & hostname */
 static int as_path;			/* print as numbers for each hop */
 static int ecnflag;			/* ECN bleaching detection flag */
 static char *as_server = NULL;
@@ -462,7 +461,6 @@ main(int argc, char *argv[])
 			useproto = IPPROTO_ICMPV6;
 			break;
 		case 'l':
-			lflag++;
 			break;
 		case 'm':
 			ep = NULL;
@@ -1584,10 +1582,8 @@ print(struct msghdr *mhdr, int cc)
 		printf(" [AS%u]", as_lookup(asn, hbuf, AF_INET6));
 	if (nflag)
 		printf(" %s", hbuf);
-	else if (lflag)
-		printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
 	else
-		printf(" %s", inetname((struct sockaddr *)from));
+		printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
 
 	if (verbose) {
 #ifdef OLDRAWSOCKET