hwmon: (lm90) Unregister hwmon device if interrupt setup fails

Commit 109b1283fb (hwmon: (lm90) Add support to handle IRQ) introduced
interrupt support. Its error handling code fails to unregister the already
registered hwmon device.

Fixes: 109b1283fb532ac773a076748ffccf76a7067cab
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/lm90.c

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 4c4c142..8b8f3aa 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -1610,12 +1610,14 @@
 						"lm90", client);
 		if (err < 0) {
 			dev_err(dev, "cannot request IRQ %d\n", client->irq);
-			goto exit_remove_files;
+			goto exit_unregister;
 		}
 	}
 
 	return 0;
 
+exit_unregister:
+	hwmon_device_unregister(data->hwmon_dev);
 exit_remove_files:
 	lm90_remove_files(client, data);
 exit_restore: