net: atm: use seq_list_foo() helpers

Simplify seq_file code.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/atm/proc.c b/net/atm/proc.c
index 476779d..7a96b23 100644
--- a/net/atm/proc.c
+++ b/net/atm/proc.c
@@ -238,7 +238,7 @@
 		"Itf Type    ESI/\"MAC\"addr "
 		"AAL(TX,err,RX,err,drop) ...               [refcnt]\n";
 
-	if (v == SEQ_START_TOKEN)
+	if (v == &atm_devs)
 		seq_puts(seq, atm_dev_banner);
 	else {
 		struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);