rtc: optee: fix error code in probe()

Return an error code if kthread_create() fails.  Currently the code
returns success.

Fixes: 6266aea ("rtc: optee: add alarm related rtc ops to optee rtc driver")
Signed-off-by: Dan Carpenter <[email protected]>
Link: https://lore.kernel.org/r/21f1a18008f1bbc8f70d0bd5c05b72fbf5fc9c7d.1758182509.git.dan.carpenter@linaro.org
Signed-off-by: Alexandre Belloni <[email protected]>

Author: Dan Carpenter

drivers/rtc/rtc-optee.c

@@ -614,6 +614,7 @@ static int optee_rtc_probe(struct device *dev)
 						  priv, "rtc_alarm_evt");
 		if (IS_ERR(priv->alarm_task)) {
 			dev_err(dev, "Failed to create alarm thread\n");
+			err = PTR_ERR(priv->alarm_task);
 			goto out_shm;
 		}