[PATCH] [media] ts2020: Variable "utmp" in function ts2020_set_tuner_rf() could be uninitialized

[Yizhuo]

In function ts2020_set_tuner_rf(), local variable "utmp" could
be uninitialized if function regmap_read() returns -EINVAL.
However, this value is used in if statement and written to
the register, which is potentially unsafe.

Signed-off-by: Yizhuo <yzhai...@ucr.edu>
---
 drivers/media/dvb-frontends/ts2020.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/ts2020.c 
b/drivers/media/dvb-frontends/ts2020.c
index 931e5c98da8a..e351039f2eae 100644
--- a/drivers/media/dvb-frontends/ts2020.c
+++ b/drivers/media/dvb-frontends/ts2020.c
@@ -177,9 +177,12 @@ static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
 {
        struct ts2020_priv *dev = fe->tuner_priv;
        int ret;
-       unsigned int utmp;
+       unsigned int utmp = 0;
 
        ret = regmap_read(dev->regmap, 0x3d, &utmp);
+       if (ret)
+               return ret;
+
        utmp &= 0x7f;
        if (utmp < 0x16)
                utmp = 0xa1;
-- 
2.17.1