b43: main: Fix use true/false for bool type

[ Upstream commit 6db774c1725059f98e4fce97f878688248584be5 ]

use true/false on bool type variable assignment.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Stable-dep-of: 581c8967d66c ("wifi: b43: Stop correct queue in DMA worker when QoS is disabled")
Signed-off-by: Sasha Levin <sashal@kernel.org>