patch applied (ghc): Correct an egregious typo in LiberateCase that emasculated it

[Simon Peyton Jones]

Fri May 11 08:55:07 PDT 2007  simonpj at microsoft.com
  * Correct an egregious typo in LiberateCase that emasculated it
  
  Somehow in the patch 
    * Record-ise the liberate-case envt, in preparation for new stuff
  I managed to make lookupLevelEnv do entirely the wrong thing.
  
  I think it was just a typo.  The result was that LiberateCase essentially
  never did anything any more.
  
  Easily fixed though!

    M ./compiler/simplCore/LiberateCase.lhs -1 +1