Drop unsolicited responses to the still attaching CODECs.
It is reported to fix kernel panics when early unsolicited responses
delivered to the CODEC device not having driver attached yet.
PR: 250248
Reported by: Rajeev Pillai <rajeev_v_pillai@yahoo.com>
Reviewed by: avg
MFC after: 2 weeks
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head/sys/dev/sound/pci/hda/hdac.c