brcmfmac: remove Comparison to bool in brcmf_p2p_send_action_frame()

Fix the following coccicheck warning:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c:1785:5-8:
WARNING: Comparison to bool
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200508074351.19193-1-yanaijie@huawei.com

drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c

@@ -1866,7 +1866,7 @@ bool brcmf_p2p_send_action_frame(struct brcmf_cfg80211_info *cfg,
 		dwell_overflow = brcmf_p2p_check_dwell_overflow(requested_dwell,
 								dwell_jiffies);
 	}
-	if (ack == false) {
+	if (!ack) {
 		bphy_err(drvr, "Failed to send Action Frame(retry %d)\n",
 			 tx_retry);
 		clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);