wifi: rtw89: Fix some error handling path in rtw89_wow_enable()

'ret' is not updated after several function calls in rtw89_wow_enable().
This prevent error handling from working.

Add the missing assignments.

Fixes: 19e28c7 ("wifi: rtw89: add WoWLAN function support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/32320176eeff1c635baeea25ef0e87d116859e65.1668354083.git.christophe.jaillet@wanadoo.fr

drivers/net/wireless/realtek/rtw89/wow.c

@@ -744,21 +744,21 @@ static int rtw89_wow_enable(struct rtw89_dev *rtwdev)
 		goto out;
 	}
 
-	rtw89_wow_swap_fw(rtwdev, true);
+	ret = rtw89_wow_swap_fw(rtwdev, true);
 	if (ret) {
 		rtw89_err(rtwdev, "wow: failed to swap to wow fw\n");
 		goto out;
 	}
 
-	rtw89_wow_fw_start(rtwdev);
+	ret = rtw89_wow_fw_start(rtwdev);
 	if (ret) {
 		rtw89_err(rtwdev, "wow: failed to let wow fw start\n");
 		goto out;
 	}
 
 	rtw89_wow_enter_lps(rtwdev);
 
-	rtw89_wow_enable_trx_post(rtwdev);
+	ret = rtw89_wow_enable_trx_post(rtwdev);
 	if (ret) {
 		rtw89_err(rtwdev, "wow: failed to enable trx_post\n");
 		goto out;