PM / sleep: fix device reference leak in test_suspend

Make sure to drop the reference taken by class_find_device() after opening the rtc device.

Fixes 77437fd4e61f ("pm: boot time suspend selftest")

Signed-off-by Johan Hovold <[email protected]>

---
 kernel/power/suspend_test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

kernel/power/suspend_test.c +3 -1

index 084452e34a12..bdff5ed57f10 100644
@@ -203,8 +203,10 @@ static int __init test_suspend(void)
 
 	/* RTCs have initialized by now too ... can we use one? */
 	dev = class_find_device(rtc_class, NULL, NULL, has_wakealarm);
-	if (dev)
+	if (dev) {
 		rtc = rtc_class_open(dev_name(dev));
+		put_device(dev);
+	}
 	if (!rtc) {
 		printk(warn_no_rtc);
 		return 0;