patch applied (ghc-6.6/testsuite): we should really exit(0) at the end of main()

[Simon Marlow]

Tue Feb 20 01:54:02 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * we should really exit(0) at the end of main()

    M ./tests/ghc-regress/concurrent/should_run/conc059_c.c +1