ath5k: remove conversion to bool in ath5k_ani_calibration()

The '>' expression itself is bool, no need to convert it to bool again.
This fixes the following coccicheck warning:

drivers/net/wireless/ath/ath5k/ani.c:504:56-61: WARNING: conversion to
bool not needed here
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200426094037.23048-1-yanaijie@huawei.com

drivers/net/wireless/ath/ath5k/ani.c

@@ -501,7 +501,7 @@ ath5k_ani_calibration(struct ath5k_hw *ah)
 
 	if (as->ofdm_errors > ofdm_high || as->cck_errors > cck_high) {
 		/* too many PHY errors - we have to raise immunity */
-		bool ofdm_flag = as->ofdm_errors > ofdm_high ? true : false;
+		bool ofdm_flag = as->ofdm_errors > ofdm_high;
 		ath5k_ani_raise_immunity(ah, as, ofdm_flag);
 		ath5k_ani_period_restart(as);