usb-redir: Never return USB_RET_NAK for async handled packets

USB_RET_NAK is not a valid response for async handled packets (and will
trigger an assert as such).

Also drop the warning when receiving a status of cancelled for packets not
cancelled by qemu itself, this can happen when a device gets unredirected
by the usbredir-host while transfers are pending.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 1811334)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

hw/usb/redirect.c

@@ -1028,11 +1028,14 @@ static int usbredir_handle_status(USBRedirDevice *dev,
     case usb_redir_stall:
         return USB_RET_STALL;
     case usb_redir_cancelled:
-        WARNING("returning cancelled packet to HC?\n");
-        return USB_RET_NAK;
+        /*
+         * When the usbredir-host unredirects a device, it will report a status
+         * of cancelled for all pending packets, followed by a disconnect msg.
+         */
+        return USB_RET_IOERROR;
     case usb_redir_inval:
         WARNING("got invalid param error from usb-host?\n");
-        return USB_RET_NAK;
+        return USB_RET_IOERROR;
     case usb_redir_babble:
         return USB_RET_BABBLE;
     case usb_redir_ioerror: