patch applied (ghc-6.6/ghc): Do not go into an infinite loop when pretty-printer finds a negative indent (Trac #1176)

[Ian Lynagh]

Thu Mar  1 03:45:13 PST 2007  simonpj at microsoft.com
  * Do not go into an infinite loop when pretty-printer finds a negative indent (Trac #1176)

    M ./compiler/utils/Pretty.lhs -4 +5