netpoll: remove IFF_IN_NETPOLL flag

V4: rebase to net-next-2.6

This patch removes the flag IFF_IN_NETPOLL, we don't need it any more since
we have netpoll_tx_running() now.

Signed-off-by: WANG Cong <amwang@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 0a3e00b..a401b8d 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -133,7 +133,7 @@
 
 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 {
-	if (unlikely(dev->priv_flags & IFF_IN_NETPOLL))
+	if (unlikely(netpoll_tx_running(dev)))
 		return atomic_read(&netpoll_block_tx);
 	return 0;
 }