message: pcm-client: be more user-friendly and fix exit code
diff: @@ -15,8 +15,13 @@ void printTitle(std::string title)
  std::cout << std::setw(26) << std::left << title;
  }
  -int main(int /*argc*/, char *argv[])
  +int main(int argc, char *argv[])
  {
  + if (argc < 2)
  + {
  + std::cerr << "Usage: " << argv[0] << " pollMs\n";
  + return -1;
  + }
  PCMDaemon::Client client;
  // client.setSharedMemoryIdLocation("/tmp/test-file");
  client.connect();
  @@ -379,5 +384,5 @@ int main(int /*argc*/, char *argv[])
  std::cout << std::flush;
  }
  - return 1;
  + return 0;
  }
  