[btcsuite/btcd] 5131b5: Fix a typo.

[Josh Rickmar]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 5131b5e39057b28d8e7f58805dfd63b71fbe9cb7
      
https://github.com/btcsuite/btcd/commit/5131b5e39057b28d8e7f58805dfd63b71fbe9cb7
  Author: Josh Rickmar <jr...@conformal.com>
  Date:   2015-04-17 (Fri, 17 Apr 2015)

  Changed paths:
    M btcjson/v2/btcjson/jsonrpc.go

  Log Message:
  -----------
  Fix a typo.