usb_ep_disable — endpoint is no longer usable
the endpoint being unconfigured. may not be the endpoint named “ep0”.
no other task may be using this endpoint when this is called. any pending and uncompleted requests will complete with status indicating disconnect (-ESHUTDOWN) before this call returns. gadget drivers must call usb_ep_enable again before queueing requests to the endpoint.
returns zero, or a negative error code.