[patch] rtc: rtc-rv8803: Fix a couple locking bugs

[Dan Carpenter <dan.carpenter@oracle.com>]

There was one missing unlock on error in rv8803_set_alarm() and one
unlock in rv8803_ioctl() which was missing altogether.

Fixes: 2f370c4a1a44 ('rtc: Add a driver for Micro Crystal RV8803')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Presumably the IOCTL issue was a last minute change after the driver had
been tested...

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index 63244eb..9508de4 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -240,8 +240,10 @@ static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	spin_lock_irqsave(&rv8803->flags_lock, irqflags);
 
 	ret = i2c_smbus_read_i2c_block_data(client, RV8803_FLAG, 2, ctrl);
-	if (ret != 2)
+	if (ret != 2) {
+		spin_unlock_irqrestore(&rv8803->flags_lock, irqflags);
 		return ret < 0 ? ret : -EIO;
+	}
 
 	alarmvals[0] = bin2bcd(alrm->time.tm_min);
 	alarmvals[1] = bin2bcd(alrm->time.tm_hour);
@@ -338,6 +340,7 @@ static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 	case RTC_VL_READ:
 		spin_lock_irqsave(&rv8803->flags_lock, irqflags);
 		flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
+		spin_unlock_irqrestore(&rv8803->flags_lock, irqflags);
 		if (flags < 0)
 			return flags;