[PATCH 4.19 259/306] ath9k_hw: fix uninitialized variable data

[Greg Kroah-Hartman]

From: Denis Efremov <efremov@xxxxxxxxx>

commit 80e84f36412e0c5172447b6947068dca0d04ee82 upstream.

Currently, data variable in ar9003_hw_thermo_cal_apply() could be
uninitialized if ar9300_otp_read_word() will fail to read the value.
Initialize data variable with 0 to prevent an undefined behavior. This
will be enough to handle error case when ar9300_otp_read_word() fails.

Fixes: 80fe43f2bbd5 ("ath9k_hw: Read and configure thermocal for AR9462")
Cc: Rajkumar Manoharan <rmanohar@xxxxxxxxxxxxxxxx>
Cc: John W. Linville <linville@xxxxxxxxxxxxx>
Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Denis Efremov <efremov@xxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/wireless/ath/ath9k/ar9003_eeprom.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -4183,7 +4183,7 @@ static void ar9003_hw_thermometer_apply(
 
 static void ar9003_hw_thermo_cal_apply(struct ath_hw *ah)
 {
-	u32 data, ko, kg;
+	u32 data = 0, ko, kg;
 
 	if (!AR_SREV_9462_20_OR_LATER(ah))
 		return;