module: make module_ktype structure constant

Since commit ee6d3dd4ed ("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 definition to prevent
modification at runtime.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

kernel/params.c

@@ -948,7 +948,7 @@ static void module_kobj_release(struct kobject *kobj)
 	complete(mk->kobj_completion);
 }
 
-struct kobj_type module_ktype = {
+const struct kobj_type module_ktype = {
 	.release   =	module_kobj_release,
 	.sysfs_ops =	&module_sysfs_ops,
 };