[PATCH -next] rtc: rv8803: fix missing unlock on error in rv8803_set_time()

[Yang Yingliang]

Add the missing unlock before return from function rv8803_set_time()
in the error handling case.

Fixes: c27fee16fab1 ("rtc: rv8803: re-initialize all Epson RX8803 registers on voltage loss")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/rtc/rtc-rv8803.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index fe1247e771b9..3527a0521e9b 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -315,8 +315,10 @@ static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
 
 	if (flags & RV8803_FLAG_V2F) {
 		ret = rv8803_regs_reset(rv8803);
-		if (ret)
+		if (ret) {
+			mutex_unlock(&rv8803->flags_lock);
 			return ret;
+		}
 	}
 
 	ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
-- 
2.25.1