[SUNGEM]: Fix netpoll bug in Sun GEM Ether driver

From: Eric Lemoine <eric.lemoine@gmail.com>

To me the bug is that __LINK_STATE_RX_SCHED can be set while
__netif_rx_schedule() hasen't be called. Why don't fix it in the
simplest way ? See attached patch (absolutely untested).

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c
index 2608e7a..3f67a42 100644
--- a/drivers/net/sungem.c
+++ b/drivers/net/sungem.c
@@ -948,6 +948,7 @@
 		u32 gem_status = readl(gp->regs + GREG_STAT);
 
 		if (gem_status == 0) {
+			netif_poll_enable(dev);
 			spin_unlock_irqrestore(&gp->lock, flags);
 			return IRQ_NONE;
 		}