message: Fix read() from /dev/urandom error handling in swoole_system_random()
  Reference: Coverity CID
diff: @@ -379,9 +379,9 @@ int swoole_system_random(int min, int max)
  next_random_byte = (char *) &random_value;
  bytes_to_read = sizeof(random_value);
  - if (read(dev_random_fd, next_random_byte, bytes_to_read) < 0)
  + if (read(dev_random_fd, next_random_byte, bytes_to_read) < bytes_to_read)
  {
  - swSysError("read() failed.");
  + swSysError("read() from /dev/urandom failed.");
  return SW_ERR;
  }
  return min + (random_value % (max - min + 1));
  