[PATCH] Make usermodehelper_init() use core_initcall()

We may as well make usermodehelper_init() core_initcall as well, to make
sure its services are avaialble to all the other initcall levels.

kernel/kmod.c

@@ -269,4 +269,4 @@ static __init int usermodehelper_init(void)
 	BUG_ON(!khelper_wq);
 	return 0;
 }
-__initcall(usermodehelper_init);
+core_initcall(usermodehelper_init);