mt76: fix invalid rssi report

Drop invalid rssi value to calculate a reasonable report

Fixes: 4550fb9e98 ("mt76: improve signal strength reporting")
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Deren Wu 2022-03-11 00:42:36 +08:00 • committed by Felix Fietkau
commit 6450b1335f