rtw88: coex: remove unnecessary variable and label

In some funciton, the variable ret just used as return value,and
out label just return ret,so ret and out label are unnecessary,
we should delete these and use return true/false to replace.
Signed-off-by: wengjianfeng <wengjianfeng@yulong.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210520005545.31272-1-samirweng1979@163.com

drivers/net/wireless/realtek/rtw88/coex.c

@@ -630,20 +630,16 @@ static bool rtw_coex_get_bt_scan_type(struct rtw_dev *rtwdev, u8 *scan_type)
 	struct rtw_coex_info_req req = {0};
 	struct sk_buff *skb;
 	u8 *payload;
-	bool ret = false;
 
 	req.op_code = BT_MP_INFO_OP_SCAN_TYPE;
 	skb = rtw_coex_info_request(rtwdev, &req);
 	if (!skb)
-		goto out;
+		return false;
 
 	payload = get_payload_from_coex_resp(skb);
 	*scan_type = GET_COEX_RESP_BT_SCAN_TYPE(payload);
 	dev_kfree_skb_any(skb);
-	ret = true;
-
-out:
-	return ret;
+	return true;
 }
 
 static bool rtw_coex_set_lna_constrain_level(struct rtw_dev *rtwdev,
@@ -651,19 +647,15 @@ static bool rtw_coex_set_lna_constrain_level(struct rtw_dev *rtwdev,
 {
 	struct rtw_coex_info_req req = {0};
 	struct sk_buff *skb;
-	bool ret = false;
 
 	req.op_code = BT_MP_INFO_OP_LNA_CONSTRAINT;
 	req.para1 = lna_constrain_level;
 	skb = rtw_coex_info_request(rtwdev, &req);
 	if (!skb)
-		goto out;
+		return false;
 
 	dev_kfree_skb_any(skb);
-	ret = true;
-
-out:
-	return ret;
+	return true;
 }
 
 #define case_BTSTATUS(src) \
@@ -3533,19 +3525,15 @@ static bool rtw_coex_get_bt_patch_version(struct rtw_dev *rtwdev,
 	struct rtw_coex_info_req req = {0};
 	struct sk_buff *skb;
 	u8 *payload;
-	bool ret = false;
 
 	req.op_code = BT_MP_INFO_OP_PATCH_VER;
 	skb = rtw_coex_info_request(rtwdev, &req);
 	if (!skb)
-		goto out;
+		return false;
 
 	payload = get_payload_from_coex_resp(skb);
 	*patch_version = GET_COEX_RESP_BT_PATCH_VER(payload);
-	ret = true;
-
-out:
-	return ret;
+	return true;
 }
 
 static bool rtw_coex_get_bt_supported_version(struct rtw_dev *rtwdev,
@@ -3554,19 +3542,15 @@ static bool rtw_coex_get_bt_supported_version(struct rtw_dev *rtwdev,
 	struct rtw_coex_info_req req = {0};
 	struct sk_buff *skb;
 	u8 *payload;
-	bool ret = false;
 
 	req.op_code = BT_MP_INFO_OP_SUPP_VER;
 	skb = rtw_coex_info_request(rtwdev, &req);
 	if (!skb)
-		goto out;
+		return false;
 
 	payload = get_payload_from_coex_resp(skb);
 	*supported_version = GET_COEX_RESP_BT_SUPP_VER(payload);
-	ret = true;
-
-out:
-	return ret;
+	return true;
 }
 
 static bool rtw_coex_get_bt_supported_feature(struct rtw_dev *rtwdev,
@@ -3575,19 +3559,15 @@ static bool rtw_coex_get_bt_supported_feature(struct rtw_dev *rtwdev,
 	struct rtw_coex_info_req req = {0};
 	struct sk_buff *skb;
 	u8 *payload;
-	bool ret = false;
 
 	req.op_code = BT_MP_INFO_OP_SUPP_FEAT;
 	skb = rtw_coex_info_request(rtwdev, &req);
 	if (!skb)
-		goto out;
+		return false;
 
 	payload = get_payload_from_coex_resp(skb);
 	*supported_feature = GET_COEX_RESP_BT_SUPP_FEAT(payload);
-	ret = true;
-
-out:
-	return ret;
+	return true;
 }
 
 struct rtw_coex_sta_stat_iter_data {