[PATCH] mt76x2: fix always true condition warning reported by static checker

[Lorenzo Bianconi]

Fix following warning reported by static checker:

drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c:35 mt76x2_tx()
warn: always true condition '(wcid->hw_key_idx != -1) => (0-255 != (-1))'

Fixes: 23405236460b ("mt76: fix transmission of encrypted mgmt frames")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianc...@redhat.com>
---
 drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c 
b/drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c
index 36afb166fa3f..c0ca0df84ed8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c
@@ -32,7 +32,7 @@ void mt76x2_tx(struct ieee80211_hw *hw, struct 
ieee80211_tx_control *control,
                msta = (struct mt76x2_sta *)control->sta->drv_priv;
                wcid = &msta->wcid;
                /* sw encrypted frames */
-               if (!info->control.hw_key && wcid->hw_key_idx != -1)
+               if (!info->control.hw_key && wcid->hw_key_idx != 0xff)
                        control->sta = NULL;
        }
 
-- 
2.17.1