rtw89: remove unneeded semicolon

Eliminate the following coccicheck warning:
./drivers/net/wireless/realtek/rtw89/pci.c:1348:2-3: Unneeded semicolon
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Fixes: e3ec7017 ("rtw89: add Realtek 802.11ax driver")
Signed-off-by: NYang Li <yang.lee@linux.alibaba.com>
Acked-by: NPing-Ke Shih <pkshih@realtek.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1634630094-1156-1-git-send-email-yang.lee@linux.alibaba.com

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

@@ -1345,7 +1345,7 @@ static int rtw89_pci_check_mdio(struct rtw89_dev *rtwdev, u8 addr, u8 speed, u16
 	default:
 		rtw89_err(rtwdev, "[ERR]Error Speed %d!\n", speed);
 		return -EINVAL;
-	};
+	}
 	rtw89_write16(rtwdev, R_AX_MDIO_CFG, val);
 	rtw89_write16_set(rtwdev, R_AX_MDIO_CFG, rw_bit);