iio: adc: hx711: constify attribute_group structures

Check for attribute_group structures that are only stored in the attrs filed of iio_info structure. As the attrs field of iio_info structures is constant, so these attribute_group structures can also be declared constant.
Done using coccinelle:

@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct attribute_group i@p = {...};

@ok1@
identifier r1.i;
position p;
struct iio_info x;
@@
x.attrs=&i@p;

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
static
+const
struct attribute_group i={...};

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct attribute_group i;

File size before:
text data bss dec hex filename
3042 480 0 3522 dc2 drivers/iio/adc/hx711.o

File size after:
text data bss dec hex filename
3098 416 0 3514 dba drivers/iio/adc/hx711.o

Signed-off-by simran singhal <[email protected]>

---
 drivers/iio/adc/hx711.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

drivers/iio/adc/hx711.c +1 -1

index 139639f..27005d8 100644
@@ -369,7 +369,7 @@ static struct attribute *hx711_attributes[] = {
 	NULL,
 };
 
-static struct attribute_group hx711_attribute_group = {
+static const struct attribute_group hx711_attribute_group = {
 	.attrs = hx711_attributes,
 };