staging: r8188eu: remove a buffer from rtw_writeN()

Remove the unnecessary buffer "u8 buf[VENDOR_CMD_MAX_DATA_LEN]" and
pass directly "data" to usbctrl_vendorreq().
Co-developed-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20210924122705.3781-10-fmdefrancesco@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/usb_ops_linux.c

@@ -171,14 +171,12 @@ int rtw_writeN(struct adapter *adapter, u32 addr, u32 length, u8 *data)
 	struct io_priv *io_priv = &adapter->iopriv;
 	struct intf_hdl *intf = &io_priv->intf;
 	u16 value = addr & 0xffff;
-	u8 buf[VENDOR_CMD_MAX_DATA_LEN] = {0};
 	int ret;
 
 	if (length > VENDOR_CMD_MAX_DATA_LEN)
 		return _FAIL;
 
-	memcpy(buf, data, length);
-	ret = usbctrl_vendorreq(intf, value, buf, (length & 0xffff), REALTEK_USB_VENQT_WRITE);
+	ret = usbctrl_vendorreq(intf, value, data, (length & 0xffff), REALTEK_USB_VENQT_WRITE);
 
 	return RTW_STATUS_CODE(ret);
 }