l2tp: check socket address type in l2tp_dfs_seq_tunnel_show

checkpatch warns about indentation and brace balancing around the
conditionally compiled code for AF_INET6 support in
l2tp_dfs_seq_tunnel_show.

By adding another check on the socket address type we can make the code
more readable while removing the checkpatch warning.
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/l2tp/l2tp_debugfs.c

@@ -146,10 +146,12 @@ static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
 
 			seq_printf(m, " from %pI6c to %pI6c\n",
 				   &np->saddr, &tunnel->sock->sk_v6_daddr);
-		} else
+		}
 #endif
-		seq_printf(m, " from %pI4 to %pI4\n",
-			   &inet->inet_saddr, &inet->inet_daddr);
+		if (tunnel->sock->sk_family == AF_INET)
+			seq_printf(m, " from %pI4 to %pI4\n",
+				   &inet->inet_saddr, &inet->inet_daddr);
+
 		if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
 			seq_printf(m, " source port %hu, dest port %hu\n",
 				   ntohs(inet->inet_sport), ntohs(inet->inet_dport));