If USB_NET_CDC_NCM is y and USB_NET_CDCETHER is m, build fails:

drivers/net/usb/cdc_ncm.o:(.rodata+0x1d8): undefined reference to 
`usbnet_cdc_update_filter'

Select USB_NET_CDCETHER for USB_NET_CDC_NCM to fix this.

Reported-by: Hulk Robot <hul...@huawei.com>
Fixes: e10dcb1b6ba7 ("net: cdc_ncm: hook into set_rx_mode to admit multicast 
traffic")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/net/usb/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
index a7fbc3ccd29e..c7bcfca7d70b 100644
--- a/drivers/net/usb/Kconfig
+++ b/drivers/net/usb/Kconfig
@@ -252,6 +252,7 @@ config USB_NET_CDC_EEM
 config USB_NET_CDC_NCM
        tristate "CDC NCM support"
        depends on USB_USBNET
+       select USB_NET_CDCETHER
        default y
        help
          This driver provides support for CDC NCM (Network Control Model
-- 
2.17.1


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