HelenOS sources

usb_endpoint_is_valid  137 uspace/lib/usb/include/usb/usb.h 	    usb_endpoint_is_valid(target->endpoint);
usb_endpoint_is_valid   65 uspace/lib/usbvirt/src/virthub_base.c 	if (!usb_endpoint_is_valid(ep) || (ep == USB_ENDPOINT_DEFAULT_CONTROL))