i2c: sprd: Validate the return value of clock initialization

The 'enable' clock of I2C master is required, we should return an error
if failed to get the 'enable' clock, to make sure the I2C driver can be
defer probe if the clock resource is not ready.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-sprd.c

@@ -466,9 +466,9 @@ static int sprd_i2c_clk_init(struct sprd_i2c *i2c_dev)
 
 	i2c_dev->clk = devm_clk_get(i2c_dev->dev, "enable");
 	if (IS_ERR(i2c_dev->clk)) {
-		dev_warn(i2c_dev->dev, "i2c%d can't get the enable clock\n",
+		dev_err(i2c_dev->dev, "i2c%d can't get the enable clock\n",
 			i2c_dev->adap.nr);
-		i2c_dev->clk = NULL;
+		return PTR_ERR(i2c_dev->clk);
 	}
 
 	return 0;
@@ -519,7 +519,10 @@ static int sprd_i2c_probe(struct platform_device *pdev)
 	if (i2c_dev->bus_freq != 100000 && i2c_dev->bus_freq != 400000)
 		return -EINVAL;
 
-	sprd_i2c_clk_init(i2c_dev);
+	ret = sprd_i2c_clk_init(i2c_dev);
+	if (ret)
+		return ret;
+
 	platform_set_drvdata(pdev, i2c_dev);
 
 	ret = clk_prepare_enable(i2c_dev->clk);