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The only usage of hdac_dev_attr_group is to put its address in an array
of pointers to const attribute_group structs. Make it const to allow the
compiler to put it in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20210131001241.2278-3-rikard.falkeborn@gmail.com

Signed-off-by: Takashi Iwai <tiwai@suse.de>