[PATCH] rtc: rs5c372: add missing error code for unknown RTC type

[Liu Dalin]

In rs5c372_probe(), when an unknown RTC type is encountered in the
switch default case, the local variable 'err' is still 0 from its
initialization. The subsequent goto to the exit label then returns
success, even though probe has failed.

Set err = -ENODEV before jumping to exit to properly report the
failure to the caller.

Fixes smatch warnings:
- drivers/rtc/rtc-rs5c372.c:860 rs5c372_probe() warn: missing error
  code 'err'

Fixes: cb26b572dc394 ("[PATCH] Update the rtc-rs5c372 driver")
Assisted-by: smatch:2.0 [static analysis]
Signed-off-by: Liu Dalin <liudalin@xxxxxxxxxxxxxxx>
---
 drivers/rtc/rtc-rs5c372.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c
index 24bd795d9d95..84407119caba 100644
--- a/drivers/rtc/rtc-rs5c372.c
+++ b/drivers/rtc/rtc-rs5c372.c
@@ -857,6 +857,7 @@ static int rs5c372_probe(struct i2c_client *client)
 		break;
 	default:
 		dev_err(&client->dev, "unknown RTC type\n");
+		err = -ENODEV;
 		goto exit;
 	}
 
-- 
2.43.0