Index: uspace/drv/block/usbmast/bo_trans.c
===================================================================
--- uspace/drv/block/usbmast/bo_trans.c	(revision d5c1051faf4391647834d99babdd4a44ee5d9700)
+++ uspace/drv/block/usbmast/bo_trans.c	(revision e211ea04fccf33d4cb2092f630a29e893e096a02)
@@ -58,7 +58,7 @@
  * @return		Error code
  */
-int usb_massstor_cmd(usbmast_fun_t *mfun, uint32_t tag, scsi_cmd_t *cmd)
-{
-	int rc;
+errno_t usb_massstor_cmd(usbmast_fun_t *mfun, uint32_t tag, scsi_cmd_t *cmd)
+{
+	errno_t rc;
 
 	if (cmd->data_in && cmd->data_out)
@@ -192,5 +192,5 @@
  * @return		Error code
  */
-int usb_massstor_reset(usbmast_dev_t *mdev)
+errno_t usb_massstor_reset(usbmast_dev_t *mdev)
 {
 	return usb_control_request_set(
@@ -234,5 +234,5 @@
 	uint8_t max_lun;
 	size_t data_recv_len;
-	int rc = usb_control_request_get(
+	errno_t rc = usb_control_request_get(
 	    usb_device_get_default_pipe(mdev->usb_dev),
 	    USB_REQUEST_TYPE_CLASS, USB_REQUEST_RECIPIENT_INTERFACE,