MLK-9691 net: fec: call .pm_qos_remove_request() in .ndo_stop() callback

Call .pm_qos_remove_request() in .ndo_stop() callback to avoid kernel
warning during enet open/close test.

Signed-off-by: Fugang Duan <B38611@freescale.com>

drivers/net/ethernet/freescale/fec_main.c

@@ -2877,6 +2877,7 @@ fec_enet_close(struct net_device *ndev)
 	fep->phy_dev = NULL;
 
 	fec_enet_clk_enable(ndev, false);
+	pm_qos_remove_request(&ndev->pm_qos_req);
 	pinctrl_pm_select_sleep_state(&fep->pdev->dev);
 	fec_enet_free_buffers(ndev);