patch applied (ghc-6.12/packages/Win32): failWith: allow GetErrorMessage to return NULL (#3815)

[Ian Lynagh]

Fri Jan 22 04:28:22 PST 2010  Simon Marlow <marlowsd at gmail.com>
  * failWith: allow GetErrorMessage to return NULL (#3815)

    M ./System/Win32/Types.hs -3 +8

View patch online:
http://darcs.haskell.org/ghc-6.12/packages/Win32/_darcs/patches/20100122122822-12142-19fe86bfbf63aca4b4aeefe048c7891bbbba998b.gz