staging: rtl8188eu: make usb_dvobj_init return a status

usb_dvobj_init populates a struct dvobj_priv and installs it as interface
data of the usb interface. There's no point in returning this struct to the
caller, it makes more sense to return an error status.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210407170531.29356-9-martin@kaiser.cx


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