[PATCH] remove one nested function from nptl/allocatestack.c

[Roland McGrath]

> +	  /* We always add at the beginning of the list.  So in this case we
> +	     only need to check the beginning of these lists to see if the
> +	     pointers at the head of the list are inconsistent.  */
> +	  list_t *l = NULL;
> +
> +	  if (stack_used.next->prev != &stack_used)
> +	    l = &stack_used;
> +	  else if (stack_cache.next->prev != &stack_cache)
> +	    l = &stack_cache;
> +
> +	  if (l)

No implicit Boolean coercion.

Otherwise this is fine.