[PATCH] fix character subsystem initialisation

chr_dev_init() should be a subsys_initcall(), since it needs to
initialize before any drivers that use the character device
infrastructure.

drivers/char/mem.c

@@ -713,4 +713,4 @@ static int __init chr_dev_init(void)
 	return 0;
 }
 
-__initcall(chr_dev_init);
+subsys_initcall(chr_dev_init);