net: mvpp2: Use devm_clk_get_optional()

Replace open coded variants of devm_clk_get_optional().
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c

@@ -7435,28 +7435,27 @@ static int mvpp2_probe(struct platform_device *pdev)
 			if (err < 0)
 				goto err_gop_clk;
 
-			priv->mg_core_clk = devm_clk_get(&pdev->dev, "mg_core_clk");
+			priv->mg_core_clk = devm_clk_get_optional(&pdev->dev, "mg_core_clk");
 			if (IS_ERR(priv->mg_core_clk)) {
-				priv->mg_core_clk = NULL;
-			} else {
-				err = clk_prepare_enable(priv->mg_core_clk);
-				if (err < 0)
-					goto err_mg_clk;
+				err = PTR_ERR(priv->mg_core_clk);
+				goto err_mg_clk;
 			}
+
+			err = clk_prepare_enable(priv->mg_core_clk);
+			if (err < 0)
+				goto err_mg_clk;
 		}
 
-		priv->axi_clk = devm_clk_get(&pdev->dev, "axi_clk");
+		priv->axi_clk = devm_clk_get_optional(&pdev->dev, "axi_clk");
 		if (IS_ERR(priv->axi_clk)) {
 			err = PTR_ERR(priv->axi_clk);
-			if (err == -EPROBE_DEFER)
-				goto err_mg_core_clk;
-			priv->axi_clk = NULL;
-		} else {
-			err = clk_prepare_enable(priv->axi_clk);
-			if (err < 0)
-				goto err_mg_core_clk;
+			goto err_mg_core_clk;
 		}
 
+		err = clk_prepare_enable(priv->axi_clk);
+		if (err < 0)
+			goto err_mg_core_clk;
+
 		/* Get system's tclk rate */
 		priv->tclk = clk_get_rate(priv->pp_clk);
 	} else if (device_property_read_u32(&pdev->dev, "clock-frequency",
@@ -7552,13 +7551,10 @@ static int mvpp2_probe(struct platform_device *pdev)
 	}
 err_axi_clk:
 	clk_disable_unprepare(priv->axi_clk);
-
 err_mg_core_clk:
-	if (priv->hw_version >= MVPP22)
-		clk_disable_unprepare(priv->mg_core_clk);
+	clk_disable_unprepare(priv->mg_core_clk);
 err_mg_clk:
-	if (priv->hw_version >= MVPP22)
-		clk_disable_unprepare(priv->mg_clk);
+	clk_disable_unprepare(priv->mg_clk);
 err_gop_clk:
 	clk_disable_unprepare(priv->gop_clk);
 err_pp_clk: