thermal: imx8mm: Use dev_err_probe() to simplify error handling

dev_err_probe() can reduce code size, uniform error handling and record the
defer probe reason etc., use it to simplify the code.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1597129185-8460-2-git-send-email-Anson.Huang@nxp.com

drivers/thermal/imx8mm_thermal.c

@@ -146,13 +146,9 @@ static int imx8mm_tmu_probe(struct platform_device *pdev)
 		return PTR_ERR(tmu->base);
 
 	tmu->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(tmu->clk)) {
-		ret = PTR_ERR(tmu->clk);
-		if (ret != -EPROBE_DEFER)
-			dev_err(&pdev->dev,
-				"failed to get tmu clock: %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(tmu->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(tmu->clk),
+				     "failed to get tmu clock\n");
 
 	ret = clk_prepare_enable(tmu->clk);
 	if (ret) {