rtw89: remove unneeded semicolon

Eliminate the following coccicheck warning:
./drivers/net/wireless/realtek/rtw89/rtw8852c.c:2556:2-3: Unneeded
semicolon
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220427003142.107916-1-yang.lee@linux.alibaba.com

drivers/net/wireless/realtek/rtw89/rtw8852c.c

@@ -2553,7 +2553,7 @@ do {								\
 	default:
 		val = arg.gnt_bt.data;
 		break;
-	};
+	}
 
 	__write_ctrl(R_AX_PWR_COEXT_CTRL, B_AX_TXAGC_BT_MASK, val,
 		     B_AX_TXAGC_BT_EN, arg.ctrl_gnt_bt != 0xffff);