watchdog: imx2_wdt: Check for clk_prepare_enable() error

clk_prepare_enable() may fail, so we should better check its return value
and propagate it in the case of error.

Signed-off-by: Fabio Estevam <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/imx2_wdt.c

···
 	wdog->max_timeout	= IMX2_WDT_MAX_TIME;
 	wdog->parent		= &pdev->dev;
 
-	clk_prepare_enable(wdev->clk);
+	ret = clk_prepare_enable(wdev->clk);
+	if (ret)
+		return ret;
 
 	regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val);
 	wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
···
 {
 	struct watchdog_device *wdog = dev_get_drvdata(dev);
 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+	int ret;
 
-	clk_prepare_enable(wdev->clk);
+	ret = clk_prepare_enable(wdev->clk);
+	if (ret)
+		return ret;
 
 	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
 		/*