[NET] front: Remove duplicate maybe_wake_tx

Since network_tx_buf_gc unconditionally calls network_maybe_wake_tx at
the end, there is no need to call it again right after a call to
network_tx_buf_gc.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c

@@ -1045,8 +1045,6 @@ static void network_connect(struct net_device *dev)
 	notify_remote_via_irq(np->irq);
 	network_tx_buf_gc(dev);
 
-	network_maybe_wake_tx(dev);
-
 	spin_unlock(&np->rx_lock);
 	spin_unlock_irq(&np->tx_lock);
 }