[conformal/btcd] d17a97: Correct verifychain RPC call return.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: d17a97b4857972181c83e051a41144ba00033947
      
https://github.com/conformal/btcd/commit/d17a97b4857972181c83e051a41144ba00033947
  Author: Dave Collins <da...@conformal.com>
  Date:   2013-12-30 (Mon, 30 Dec 2013)

  Changed paths:
    M rpcserver.go

  Log Message:
  -----------
  Correct verifychain RPC call return.

The return value should be a boolean for compatibility.