Core: Handle TRANSFER_ERROR/TRANSFER_CANCELLED for sync transfers

* Return the more appropriate LIBUSB_ERROR_IO instead of
  LIBUSB_ERROR_OTHER for the cases LIBUSB_TRANSFER_ERROR and
  LIBUSB_TRANSFER_CANCELLED
* Fixes warnings similar to the following when using the GCC
  option -Wswitch-enum:
  warning: enumeration value ‘LIBUSB_TRANSFER_ERROR’ not handled in switch

libusb/sync.c

@@ -135,6 +135,10 @@ int API_EXPORTED libusb_control_transfer(libusb_device_handle *dev_handle,
 	case LIBUSB_TRANSFER_OVERFLOW:
 		r = LIBUSB_ERROR_OVERFLOW;
 		break;
+	case LIBUSB_TRANSFER_ERROR:
+	case LIBUSB_TRANSFER_CANCELLED:
+		r = LIBUSB_ERROR_IO;
+		break;
 	default:
 		usbi_warn(HANDLE_CTX(dev_handle),
 			"unrecognised status code %d", transfer->status);
@@ -205,6 +209,10 @@ static int do_sync_bulk_transfer(struct libusb_device_handle *dev_handle,
 	case LIBUSB_TRANSFER_NO_DEVICE:
 		r = LIBUSB_ERROR_NO_DEVICE;
 		break;
+	case LIBUSB_TRANSFER_ERROR:
+	case LIBUSB_TRANSFER_CANCELLED:
+		r = LIBUSB_ERROR_IO;
+		break;
 	default:
 		usbi_warn(HANDLE_CTX(dev_handle),
 			"unrecognised status code %d", transfer->status);

libusb/version.h

@@ -9,7 +9,7 @@
 #define LIBUSB_MICRO 11
 #endif
 #ifndef LIBUSB_NANO
-#define LIBUSB_NANO 10496
+#define LIBUSB_NANO 10497
 #endif
 /* LIBUSB_RC is the release candidate suffix. Should normally be empty. */
 #ifndef LIBUSB_RC