livepatch: Make kobj_type structures constant

Since commit ee6d3dd4 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definitions to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230217-kobj_type-livepatch-v1-1-06ded292e897@weissschuh.net

kernel/livepatch/core.c

@@ -596,7 +596,7 @@ static void klp_kobj_release_patch(struct kobject *kobj)
 	complete(&patch->finish);
 }
 
-static struct kobj_type klp_ktype_patch = {
+static const struct kobj_type klp_ktype_patch = {
 	.release = klp_kobj_release_patch,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = klp_patch_groups,
@@ -612,7 +612,7 @@ static void klp_kobj_release_object(struct kobject *kobj)
 		klp_free_object_dynamic(obj);
 }
 
-static struct kobj_type klp_ktype_object = {
+static const struct kobj_type klp_ktype_object = {
 	.release = klp_kobj_release_object,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = klp_object_groups,
@@ -628,7 +628,7 @@ static void klp_kobj_release_func(struct kobject *kobj)
 		klp_free_func_nop(func);
 }
 
-static struct kobj_type klp_ktype_func = {
+static const struct kobj_type klp_ktype_func = {
 	.release = klp_kobj_release_func,
 	.sysfs_ops = &kobj_sysfs_ops,
 };