pkt_sched: remov unnecessary bh_disable

Now that est_tree_lock is acquired with BH protection, the other
call is unnecessary.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 6743146..7c23733 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -274,9 +274,9 @@
 	while ((e = gen_find_node(bstats, rate_est))) {
 		rb_erase(&e->node, &est_root);
 
-		write_lock_bh(&est_lock);
+		write_lock(&est_lock);
 		e->bstats = NULL;
-		write_unlock_bh(&est_lock);
+		write_unlock(&est_lock);
 
 		list_del_rcu(&e->list);
 		call_rcu(&e->e_rcu, __gen_kill_estimator);