ALSA: hda: Ignore unsol events for cards being shut down

For the classic snd_hda_intel driver, codec->card and bus->card point to
the exact same thing. When snd_card_diconnect() fires, bus->shutdown is
set thanks to azx_dev_disconnect(). card->shutdown is already set when
that happens but both provide basically the same functionality.

For the DSP snd_soc_avs driver where multiple codecs are located on
multiple cards, bus->shutdown 'shortcut' is not sufficient. One codec
card may be unregistered while other codecs are still operational.
Proper check in form of card->shutdown must be used to verify whether
the codec's card is being shut down.

Reviewed-by: Amadeusz Sławiński <[email protected]>
Signed-off-by: Cezary Rojewski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

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