net: remove bh disabling around percpu_counter accesses

Shaohua Li made percpu_counter irq safe in commit 098faf5805c8
("percpu_counter: make APIs irq safe")

We can safely remove BH disable/enable sections around various
percpu_counter manipulations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 096a085..c7f7c53 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -836,9 +836,8 @@
 
 	sk_refcnt_debug_release(sk);
 
-	local_bh_disable();
 	percpu_counter_dec(sk->sk_prot->orphan_count);
-	local_bh_enable();
+
 	sock_put(sk);
 }
 EXPORT_SYMBOL(inet_csk_destroy_sock);