net: fec: drop check for clk==NULL before calling clk_*

clk_prepare, clk_enable and their counterparts (at least the common clk
ones, but also most others) do check for the clk being NULL anyhow (and
return 0 then), so there is no gain when the caller checks, too.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec_main.c

@@ -1841,11 +1841,11 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
 		ret = clk_prepare_enable(fep->clk_ahb);
 		if (ret)
 			return ret;
-		if (fep->clk_enet_out) {
+
 		ret = clk_prepare_enable(fep->clk_enet_out);
 		if (ret)
 			goto failed_clk_enet_out;
-		}
+
 		if (fep->clk_ptp) {
 			mutex_lock(&fep->ptp_clk_mutex);
 			ret = clk_prepare_enable(fep->clk_ptp);
@@ -1857,14 +1857,12 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
 			}
 			mutex_unlock(&fep->ptp_clk_mutex);
 		}
-		if (fep->clk_ref) {
+
 		ret = clk_prepare_enable(fep->clk_ref);
 		if (ret)
 			goto failed_clk_ref;
-		}
 	} else {
 		clk_disable_unprepare(fep->clk_ahb);
-		if (fep->clk_enet_out)
 		clk_disable_unprepare(fep->clk_enet_out);
 		if (fep->clk_ptp) {
 			mutex_lock(&fep->ptp_clk_mutex);
@@ -1872,7 +1870,6 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
 			fep->ptp_clk_on = false;
 			mutex_unlock(&fep->ptp_clk_mutex);
 		}
-		if (fep->clk_ref)
 		clk_disable_unprepare(fep->clk_ref);
 	}