pbio/drv/usb/usb_nxt.c: Remove extra null packet in configuration descriptor

This should not be needed, and it may be causing enumeration issues on Windows.

Author: ArcaneNibble

lib/pbio/drv/usb/usb_nxt.c

@@ -446,11 +446,6 @@ static void pbdrv_usb_handle_std_request(pbdrv_usb_nxt_setup_packet_t *packet) {
                 case USB_DESC_TYPE_CONFIG: /* Configuration descriptor */
                     pbdrv_usb_nxt_write_data(0, &pbdrv_usb_nxt_full_config,
                         MIN(pbdrv_usb_nxt_full_config.conf_desc.wTotalLength, packet->length));
-
-                    /* TODO: Why? This is not specified in the USB specs. */
-                    if (pbdrv_usb_nxt_full_config.conf_desc.wTotalLength < packet->length) {
-                        pbdrv_usb_nxt_send_null();
-                    }
                     break;
 
                 case USB_DESC_TYPE_STR: /* String or language info. */