mt76: Fix comparisons with invalid hardware key index
[ Upstream commit 81c8eccc2404d06082025b773f1d90e8c861bc6a ] With gcc 4.1.2: drivers/net/wireless/mediatek/mt76/mt76x0/tx.c: In function ‘mt76x0_tx’: drivers/net/wireless/mediatek/mt76/mt76x0/tx.c:169: warning: comparison is always true due to limited range of data type drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c: In function ‘mt76x2_tx’: drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c:35: warning: comparison is always true due to limited range of data type While assigning -1 to a u8 works fine, comparing with -1 does not work as expected. Fix this by comparing with 0xff, like is already done in some other places. Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NKalle Valo <kvalo@codeaurora.org> Signed-off-by: NSasha Levin <sashal@kernel.org>
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