drivers/rtc/rtc-wm831x.c: convert to devm_kzalloc()

Marginally less code and eliminate the possibility of memory leaks.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/rtc-wm831x.c b/drivers/rtc/rtc-wm831x.c
index dabbd45..657c6f6 100644
--- a/drivers/rtc/rtc-wm831x.c
+++ b/drivers/rtc/rtc-wm831x.c
@@ -399,7 +399,7 @@
 	int alm_irq = platform_get_irq_byname(pdev, "ALM");
 	int ret = 0;
 
-	wm831x_rtc = kzalloc(sizeof(*wm831x_rtc), GFP_KERNEL);
+	wm831x_rtc = devm_kzalloc(&pdev->dev, sizeof(*wm831x_rtc), GFP_KERNEL);
 	if (wm831x_rtc == NULL)
 		return -ENOMEM;
 
@@ -434,7 +434,6 @@
 	return 0;
 
 err:
-	kfree(wm831x_rtc);
 	return ret;
 }
 
@@ -445,7 +444,6 @@
 
 	free_irq(alm_irq, wm831x_rtc);
 	rtc_device_unregister(wm831x_rtc->rtc);
-	kfree(wm831x_rtc);
 
 	return 0;
 }