brcmsmac: Use DIV_ROUND_CLOSEST directly to make it readable

The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d
but is perhaps more readable.
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c

@@ -17748,7 +17748,7 @@ static void wlc_phy_txpwrctrl_pwr_setup_nphy(struct brcms_phy *pi)
 			num = 8 *
 			      (16 * b0[tbl_id - 26] + b1[tbl_id - 26] * idx);
 			den = 32768 + a1[tbl_id - 26] * idx;
-			pwr_est = max(((4 * num + den / 2) / den), -8);
+			pwr_est = max(DIV_ROUND_CLOSEST(4 * num, den), -8);
 			if (NREV_LT(pi->pubpi.phy_rev, 3)) {
 				if (idx <=
 				    (uint) (31 - idle_tssi[tbl_id - 26] + 1))
@@ -26990,8 +26990,8 @@ wlc_phy_rxcal_gainctrl_nphy_rev5(struct brcms_phy *pi, u8 rx_core,
 				     NPHY_RXCAL_TONEAMP, 0, cal_type, false);
 
 		wlc_phy_rx_iq_est_nphy(pi, est, num_samps, 32, 0);
-		i_pwr = (est[rx_core].i_pwr + num_samps / 2) / num_samps;
-		q_pwr = (est[rx_core].q_pwr + num_samps / 2) / num_samps;
+		i_pwr = DIV_ROUND_CLOSEST(est[rx_core].i_pwr, num_samps);
+		q_pwr = DIV_ROUND_CLOSEST(est[rx_core].q_pwr, num_samps);
 		curr_pwr = i_pwr + q_pwr;
 
 		switch (gainctrl_dirn) {
@@ -27673,10 +27673,10 @@ wlc_phy_cal_rxiq_nphy_rev2(struct brcms_phy *pi,
 					wlc_phy_rx_iq_est_nphy(pi, est,
 							       num_samps, 32,
 							       0);
-					i_pwr =	(est[rx_core].i_pwr +
-						 num_samps / 2) / num_samps;
-					q_pwr =	(est[rx_core].q_pwr +
-						 num_samps / 2) / num_samps;
+					i_pwr = DIV_ROUND_CLOSEST(est[rx_core].i_pwr,
+									 num_samps);
+					q_pwr = DIV_ROUND_CLOSEST(est[rx_core].q_pwr,
+									 num_samps);
 					tot_pwr[gain_pass] = i_pwr + q_pwr;
 				} else {