iio: adc: ad7091r8: make ad7091r_init_info const

Add const qualifier to struct ad7091r_init_info ad7091r*_init_info. This
is read-only data so it can be made const.

Signed-off-by: David Lechner <[e-mail]>
Acked-by: Marcelo Schmitt <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/ad7091r8.c

···
 	return 0;
 }
 
-static struct ad7091r_init_info ad7091r2_init_info = {
+static const struct ad7091r_init_info ad7091r2_init_info = {
 	.info_no_irq = &ad7091r8_infos[AD7091R2_INFO],
 	.regmap_config = &ad7091r2_reg_conf,
 	.init_adc_regmap = &ad7091r8_regmap_init,
 	.setup = &ad7091r8_gpio_setup
 };
 
-static struct ad7091r_init_info ad7091r4_init_info = {
+static const struct ad7091r_init_info ad7091r4_init_info = {
 	.info_no_irq = &ad7091r8_infos[AD7091R4_INFO],
 	.info_irq = &ad7091r8_infos[AD7091R4_INFO_IRQ],
 	.regmap_config = &ad7091r4_reg_conf,
···
 	.setup = &ad7091r8_gpio_setup
 };
 
-static struct ad7091r_init_info ad7091r8_init_info = {
+static const struct ad7091r_init_info ad7091r8_init_info = {
 	.info_no_irq = &ad7091r8_infos[AD7091R8_INFO],
 	.info_irq = &ad7091r8_infos[AD7091R8_INFO_IRQ],
 	.regmap_config = &ad7091r8_reg_conf,