darcs patch: fix exit code of ghci -e "return ()"

[Bertram Felgenhauer]

Thu May  3 23:25:14 CEST 2007  Bertram Felgenhauer <int-e at gmx.de>
  * fix exit code of ghci -e "return ()"
  This should result in successful program termination. Not doing this
  breaks checking the exit code of  runghc Setup.lhs build  for example.

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