ALSA: hda: Constify static attribute_group

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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

sound/hda/hdac_sysfs.c

@@ -66,7 +66,7 @@ static struct attribute *hdac_dev_attrs[] = {
 	NULL
 };
 
-static struct attribute_group hdac_dev_attr_group = {
+static const struct attribute_group hdac_dev_attr_group = {
 	.attrs	= hdac_dev_attrs,
 };