staging: lustre: ldlm: 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/ldlm/ldlm_lockd.c

@@ -926,7 +926,7 @@ static struct attribute *ldlm_attrs[] = {
 	NULL,
 };
 
-static struct attribute_group ldlm_attr_group = {
+static const struct attribute_group ldlm_attr_group = {
 	.attrs = ldlm_attrs,
 };