message: Fix fd leak in swSocket_sendfile_sync()
  Reference: Coverity CID
diff: @@ -33,6 +33,7 @@ int swSocket_sendfile_sync(int sock, char *filename, off_t offset, double timeou
  if (fstat(file_fd, &file_stat) < 0)
  {
  swWarn("fstat() failed. Error: %s[%d]", strerror(errno), errno);
  + close(file_fd);
  return SW_ERR;
  }
  