staging: rtl8188eu: handle errors from dev_alloc_name

Fail the usb interface initialization if dev_alloc_name returns an error.

Other wlan drivers like natsemi or atmel use the same error handling.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210620175301.14988-1-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>