[robocup-small] Referee Box Bug Fix

[Christopher Head]

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Hi,
I've attached another small patch to the referee box, this one to fix a
bug that affects some people and not others. Specifically, in
logging.cc, there is a call to va_start(), and the va_list is used in
both vsnprintf and vprintf. According to the man page:

> These functions do not  call  the  va_end  macro. Because they invoke
> the va_arg macro, the value of ap is undefined after the call.

The attached patch fixes this by just reusing the "message" buffer
instead. This crashes the refbox on a 64-bit machine running GCC 4.4.1.

Thanks!
Chris
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