[conformal/btcd] eecea4: Preallocate the tx serialization buffer.

[David Hill]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: eecea4180a420eda6baa4ee91ccc5ddc8bb0b0a6
      
https://github.com/conformal/btcd/commit/eecea4180a420eda6baa4ee91ccc5ddc8bb0b0a6
  Author: David Hill <dh...@conformal.com>
  Date:   2014-03-20 (Thu, 20 Mar 2014)

  Changed paths:
    M rpcwebsocket.go

  Log Message:
  -----------
  Preallocate the tx serialization buffer.
Benchmarking shows this is slightly faster due to avoiding the extra
garbage collection in addition to less peak memory usage.

ok @davecgh