staging: lustre: obdclass: linux: constify attribute_group structures.

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work
with const attribute_group. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdclass/linux/linux-module.c

@@ -405,7 +405,7 @@ static const struct file_operations obd_device_list_fops = {
 struct kobject *lustre_kobj;
 EXPORT_SYMBOL_GPL(lustre_kobj);
 
-static struct attribute_group lustre_attr_group = {
+static const struct attribute_group lustre_attr_group = {
 	.attrs = lustre_attrs,
 };
 

drivers/staging/lustre/lustre/obdclass/linux/linux-sysctl.c

@@ -151,7 +151,7 @@ static struct attribute *lustre_attrs[] = {
 	NULL,
 };
 
-static struct attribute_group lustre_attr_group = {
+static const struct attribute_group lustre_attr_group = {
 	.attrs = lustre_attrs,
 };