ath11k: remove conversion to bool in ath11k_dp_rxdesc_mpdu_valid()

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

drivers/net/wireless/ath/ath11k/dp_rx.c:255:46-51: 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/20200420123718.3384-1-yanaijie@huawei.com

drivers/net/wireless/ath/ath11k/dp_rx.c

@@ -252,7 +252,7 @@ static bool ath11k_dp_rxdesc_mpdu_valid(struct hal_rx_desc *rx_desc)
 	tlv_tag = FIELD_GET(HAL_TLV_HDR_TAG,
 			    __le32_to_cpu(rx_desc->mpdu_start_tag));
 
-	return tlv_tag == HAL_RX_MPDU_START ? true : false;
+	return tlv_tag == HAL_RX_MPDU_START;
 }
 
 static u32 ath11k_dp_rxdesc_get_ppduid(struct hal_rx_desc *rx_desc)