[Xmonad] darcs patch: fix leak in Combo.

[Donald Bruce Stewart]

droundy:
> Hi all,
> 
> Here is a pretty important fix to Combo.  Fortunately, I doubt anyone but
> myself has been using this, so I'm probably the only one with vastly
> bloated memory use in my X server.  It does make me wonder if there's a
> better design we could use, though.  :(
> 

Applied. It was noticed (at least on irc, it was mentioned).

We joked that it must have been the simulated annealing, or the monte
carlo code, kicking in... ;)

-- Don