l2tp: prefer seq_puts for unformatted output

checkpatch warns about use of seq_printf where seq_puts would do.

Modify l2tp_debugfs accordingly.
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/l2tp/l2tp_debugfs.c

@@ -199,7 +199,7 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
 			seq_printf(m, "%02x%02x%02x%02x",
 				   session->cookie[4], session->cookie[5],
 				   session->cookie[6], session->cookie[7]);
-		seq_printf(m, "\n");
+		seq_puts(m, "\n");
 	}
 	if (session->peer_cookie_len) {
 		seq_printf(m, "   peer cookie %02x%02x%02x%02x",
@@ -209,7 +209,7 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
 			seq_printf(m, "%02x%02x%02x%02x",
 				   session->peer_cookie[4], session->peer_cookie[5],
 				   session->peer_cookie[6], session->peer_cookie[7]);
-		seq_printf(m, "\n");
+		seq_puts(m, "\n");
 	}
 
 	seq_printf(m, "   %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n",