[GHC] #9028: [CID43167] Fix memleak in hp2ps

[GHC]

#9028: [CID43167] Fix memleak in hp2ps
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       Reporter:  nicolast          |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  None              |           Version:  7.8.2
       Keywords:  coverity, hp2ps   |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 Coverity found a memleak in hp2ps, an allocated buffer not being freed.

 Attached patch adds the free call.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9028>
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