this changes if() BUG(); constructs to BUG_ON() which is
cleaner, contains unlikely() and can better optimized away.
Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
  */
 void __ptrace_link(task_t *child, task_t *new_parent)
 {
-       if (!list_empty(&child->ptrace_list))
-               BUG();
+       BUG_ON(!list_empty(&child->ptrace_list));
        if (child->parent == new_parent)
                return;
        list_add(&child->ptrace_list, &child->parent->ptrace_children);