rtlwifi: remove duplicate code

Remove and refactor some code in order to avoid having identical code
for different branches.

Notice that the logic has been there since 2014.

Addresses-Coverity-ID: 1426199 ("Identical code for different branches")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b2ant.c

@@ -2876,25 +2876,10 @@ static void btc8723b2ant_action_hid(struct btc_coexist *btcoexist)
 		btc8723b2ant_ps_tdma(btcoexist, NORMAL_EXEC, true, 13);
 
 	/* sw mechanism */
-	if (BTC_WIFI_BW_HT40 == wifi_bw) {
-		if ((wifi_rssi_state == BTC_RSSI_STATE_HIGH) ||
-		    (wifi_rssi_state == BTC_RSSI_STATE_STAY_HIGH)) {
-			btc8723b2ant_sw_mechanism(btcoexist, true, true,
-						  false, false);
-		} else {
-			btc8723b2ant_sw_mechanism(btcoexist, true, true,
-						  false, false);
-		}
-	} else {
-		if ((wifi_rssi_state == BTC_RSSI_STATE_HIGH) ||
-		    (wifi_rssi_state == BTC_RSSI_STATE_STAY_HIGH)) {
-			btc8723b2ant_sw_mechanism(btcoexist, false, true,
-						  false, false);
-		} else {
-			btc8723b2ant_sw_mechanism(btcoexist, false, true,
-						  false, false);
-		}
-	}
+	if (wifi_bw == BTC_WIFI_BW_HT40)
+		btc8723b2ant_sw_mechanism(btcoexist, true, true, false, false);
+	else
+		btc8723b2ant_sw_mechanism(btcoexist, false, true, false, false);
 }
 
 /* A2DP only / PAN(EDR) only/ A2DP+PAN(HS) */