[GHC] #11183: Numeric.showFFloat outputs decimal point when it should not.

[GHC]

#11183: Numeric.showFFloat outputs decimal point when it should not.
-------------------------------------+-------------------------------------
           Reporter:  Dobiasd        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  7.10.2
  libraries/base                     |
           Keywords:  Numeric,       |  Operating System:  Unknown/Multiple
  showFFloat, showFFloatAlt          |
       Architecture:                 |   Type of failure:  Incorrect result
  Unknown/Multiple                   |  at runtime
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 {{{#!hs
 showFFloat Nothing 42 ""
 }}}

 The expression above should give "42" but actually gives "42.0". Only
 showFFloatAlt should do this.

 Minimal example: http://ideone.com/yYvqrf

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11183>
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