staging: octeon-usb: return transferred bytes only on success

Return transferred bytes only when transfer was successful.

Signed-off-by: Aaro Koskinen <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/octeon-usb/octeon-hcd.c

···
 	struct usb_hcd *hcd = octeon_to_hcd(priv);
 	struct device *dev = hcd->self.controller;
 
-	urb->actual_length = bytes_transferred;
+	if (likely(status == CVMX_USB_COMPLETE_SUCCESS))
+		urb->actual_length = bytes_transferred;
+	else
+		urb->actual_length = 0;
+
 	urb->hcpriv = NULL;
 
 	/* For Isochronous transactions we need to update the URB packet status