can: xilinx_can: Simplify code by using dev_err_probe()

Use already prepared dev_err_probe() introduced by commit a787e5400a1c
("driver core: add device probe log helper").
It simplifies EPROBE_DEFER handling.

Also unify message format for similar error cases.

Link: https://lore.kernel.org/r/91af[e-mail]
Signed-off-by: Michal Simek <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

drivers/net/can/xilinx_can.c

···
 	/* Getting the CAN can_clk info */
 	priv->can_clk = devm_clk_get(&pdev->dev, "can_clk");
 	if (IS_ERR(priv->can_clk)) {
-		if (PTR_ERR(priv->can_clk) != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "Device clock not found.\n");
-		ret = PTR_ERR(priv->can_clk);
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(priv->can_clk),
+				    "device clock not found\n");
 		goto err_free;
 	}
 
 	priv->bus_clk = devm_clk_get(&pdev->dev, devtype->bus_clk_name);
 	if (IS_ERR(priv->bus_clk)) {
-		if (PTR_ERR(priv->bus_clk) != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "bus clock not found\n");
-		ret = PTR_ERR(priv->bus_clk);
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(priv->bus_clk),
+				    "bus clock not found\n");
 		goto err_free;
 	}