wifi: ath9k: Remove unnecessary ternary operators

Ther are a little ternary operators, the true or false judgement
of which is unnecessary in C language semantics.

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230731124455.2039184-1-ruanjinjie@huawei.com