[ATM]: Suppress some sparse warnings

  CHECK   net/atm/br2684.c
net/atm/br2684.c:665:13: warning: context imbalance in 'br2684_seq_start' - wrong count at exit
net/atm/br2684.c:676:13: warning: context imbalance in 'br2684_seq_stop' - unexpected unlock
  CHECK   net/atm/lec.c
net/atm/lec.c:196:23: warning: expensive signed divide
  CHECK   net/atm/proc.c
net/atm/proc.c:151:14: warning: context imbalance in 'vcc_seq_start' - wrong count at exit
net/atm/proc.c:154:13: warning: context imbalance in 'vcc_seq_stop' - unexpected unlock

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index 5c8a0dc..574d9a9 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -663,6 +663,7 @@
 
 #ifdef CONFIG_PROC_FS
 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
+	__acquires(devs_lock)
 {
 	read_lock(&devs_lock);
 	return seq_list_start(&br2684_devs, *pos);
@@ -674,6 +675,7 @@
 }
 
 static void br2684_seq_stop(struct seq_file *seq, void *v)
+	__releases(devs_lock)
 {
 	read_unlock(&devs_lock);
 }