ALSA: au88x0 - Avoid possible Oops at unbinding
The irq handler must check whether the MPU401 instance is still alive.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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The irq handler must check whether the MPU401 instance is still alive.
Signed-off-by: Takashi Iwai <tiwai@suse.de>