[Qemu-devel] [USB fixes for 1.3] Fix some interrupt eps not properly nak-ing

[Hans de Goede]

As will become clear in my next patchset, I've been reviewing all usb-devices
in qemu with interrupt endpoints to add wakeup calls to all of them, during
this I found that the bt and smartcard-reader devices don't properly return
NAK from interrupt endpoints when they've no data, these patches fix this.

Regards,

Hans