message: [lldb] Fix log statement in Socket::Write
  We change num_bytes in this method, so this doesn't actually
  log the parameter that we called the function with. No test
  as we don't test logging code.
diff: @@ -353,6 +353,7 @@ Status Socket::Read(void *buf, size_t &num_bytes) {
  }
  Status Socket::Write(const void *buf, size_t &num_bytes) {
  + const size_t src_len = num_bytes;
  Status error;
  int bytes_sent = 0;
  do {
  @@ -372,7 +373,7 @@ Status Socket::Write(const void *buf, size_t &num_bytes) {
  ", src = %p, src_len = %" PRIu64 ", flags = 0) => %" PRIi64
  " (error = %s)",
  static_cast<void *>(this), static_cast<uint64_t>(m_socket), buf,
  - static_cast<uint64_t>(num_bytes),
  + static_cast<uint64_t>(src_len),
  static_cast<int64_t>(bytes_sent), error.AsCString());
  }
  