imx-drm: ipu-common: Check the return value from clk_prepare_enable()

clk_prepare_enable() may fail, so let's check its return value and propagate it
in the case of error.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/imx-drm/ipu-v3/ipu-common.c

@@ -1087,7 +1087,11 @@ static int ipu_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, ipu);
 
-	clk_prepare_enable(ipu->clk);
+	ret = clk_prepare_enable(ipu->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
+		return ret;
+	}
 
 	ipu->dev = &pdev->dev;
 	ipu->irq_sync = irq_sync;