usb: ohci: fix error return code in servicing iso td

It should return 1 if an error occurs when reading iso td.
This will avoid an infinite loop issue in ohci_service_ed_list.
Signed-off-by: NLi Qiang <liqiang6-s@360.cn>
Message-id: 5899ac3e.1033240a.944d5.9a2d@mx.google.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-ohci.c

@@ -725,7 +725,7 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed,
     if (ohci_read_iso_td(ohci, addr, &iso_td)) {
         trace_usb_ohci_iso_td_read_failed(addr);
         ohci_die(ohci);
-        return 0;
+        return 1;
     }
 
     starting_frame = OHCI_BM(iso_td.flags, TD_SF);