e1000e: Fix logic reversal keeping link active

A logic mishap caused the adapter to keep link while we can
disable it due to WoL not being active, and vice versa.
Signed-off-by: NAuke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/e1000e/netdev.c

@@ -2008,7 +2008,7 @@ static void e1000_power_down_phy(struct e1000_adapter *adapter)
 	u16 mii_reg;
 
 	/* WoL is enabled */
-	if (!adapter->wol)
+	if (adapter->wol)
 		return;
 
 	/* non-copper PHY? */