Fix not removing resource from procgroup->resource_tree during pg cleanup

kernel/proc/resource.c

@@ -103,6 +103,7 @@ void proc_delete_resource (struct procgroup* procgroup, struct proc_resource* re
   spin_lock (&resource->lock);
 
   id_free (&procgroup->rid_alloc, resource->rid);
+  rbtree_delete (&procgroup->resource_tree, &resource->resource_tree_link);
 
   spin_unlock (&resource->lock);
   spin_unlock (&procgroup->lock);