Index: uspace/lib/usbhost/include/usb/host/bus.h
===================================================================
--- uspace/lib/usbhost/include/usb/host/bus.h	(revision c21e6a5172262a245f7e805a5cb9885ee65024b4)
+++ uspace/lib/usbhost/include/usb/host/bus.h	(revision d345ce2f2396010ea2fd5ad90e85202da83d5197)
@@ -157,7 +157,7 @@
     usbhc_iface_transfer_callback_t, void *, const char *);
 
-ssize_t bus_device_send_batch_sync(device_t *, usb_target_t,
+errno_t bus_device_send_batch_sync(device_t *, usb_target_t,
     usb_direction_t direction, char *, size_t, uint64_t,
-    const char *);
+    const char *, size_t *);
 
 int bus_endpoint_add(device_t *, const usb_endpoint_descriptors_t *, endpoint_t **);