rtw88: fix spelling mistake "fimrware" -> "firmware"

There are spelling mistakes in two rtw_err error messages. Fix them.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200424084733.7716-1-colin.king@canonical.com

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

@@ -830,7 +830,7 @@ download_firmware_legacy(struct rtw_dev *rtwdev, const u8 *data, u32 size)
 		write_firmware_page(rtwdev, page, data, last_page_size);
 
 	if (!check_hw_ready(rtwdev, REG_MCUFW_CTRL, BIT_FWDL_CHK_RPT, 1)) {
-		rtw_err(rtwdev, "failed to check download fimrware report\n");
+		rtw_err(rtwdev, "failed to check download firmware report\n");
 		return -EINVAL;
 	}
 
@@ -857,7 +857,7 @@ static int download_firmware_validate_legacy(struct rtw_dev *rtwdev)
 		msleep(20);
 	}
 
-	rtw_err(rtwdev, "failed to validate fimrware\n");
+	rtw_err(rtwdev, "failed to validate firmware\n");
 	return -EINVAL;
 }