hdac: replace sketchy printf for unowned lock with a lock assertion

[emaste]

hdac_send_command is called from one place that takes the lock and from

static uint32_t
hdac_codec_command(device_t dev, device_t child, uint32_t verb)
{

        return (hdac_send_command(device_get_softc(dev),
            (intptr_t)device_get_ivars(child), verb));
}

        DEVMETHOD(hdac_codec_command,   hdac_codec_command),

hdac.h

#define hda_command(dev, verb)                                  \
    HDAC_CODEC_COMMAND(device_get_parent(dev), (dev), (verb))

[mav]

This seems to be a very old piece of code. :)

[emaste]

This seems to be a very old piece of code. :)

Indeed :)

I knew next to nothing about snd_hda last week; I'm reading through it to understand how it works and finding little nits like this along the way.