icE1usb: Don't consider altsetting with no endpoints as "ON"

find_altsetting_on() must not only find an altsetting with no
zero-sized endpoints, but must also make sure there actually
are endpoints.

This enables compatibility with icE1usb firmware >= 0.1-43-g9674436

drivers/dahdi/icE1usb/icE1usb.c

@@ -862,7 +862,7 @@ static const struct usb_host_interface *find_altsetting_on(struct usb_interface
 
 	for (i = 0; i < intf->num_altsetting; i++) {
 		const struct usb_host_interface *alt = &intf->altsetting[i];
-		if (!has_ep_packetsize_zero(alt))
+		if (!has_ep_packetsize_zero(alt) && alt->desc.bNumEndpoints >= 3)
 			return alt;
 	}
 	return NULL;