[airstrike] problem with bomb collisions

[Ulf Ekström]

Hi,

> What seems to happen is this:
> 0. Rate limit passes through
> 1. Sprite is created, new rate limit set
>     -> sprite gets visible and everything is OK
> 2. Sprite is killed
>     -> ojb_lock(obj_id) fails
> 3. Rate limit passes through
> 4. Sprite is created, new rate limit is set
>     -> sprite doesn't come visible & obj_lock() on it's id fails
> And this loops then to 0.
> 
> I.e. for some reason locking each other created sprite doesn't for some
> reason work properly.

Well, the problem is still here. I don't understand it, but it looks
like some "invisible" sprites are create. I will look around some
more.