PS3: fix the bug that 'ifconfig down' would hang

Fix the bug that 'ifconfig eth0 down' would hang up, reported by Stefan
Assmann <sassmann@suse.de>.
As we removed netif_poll_enable() from dev->open(), we should not use
netif_poll_disable() in dev->stop().
Signed-off-by: NMasakazu Mokuno <mokuno@sm.sony.co.jp>
CC: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/ps3_gelic_net.c

@@ -556,7 +556,6 @@ static int gelic_net_stop(struct net_device *netdev)
 {
 	struct gelic_net_card *card = netdev_priv(netdev);
 
-	netif_poll_disable(netdev);
 	netif_stop_queue(netdev);
 
 	/* turn off DMA, force end */