message: Fix: read from pointer after free
  Reference: Coverity CID
diff: @@ -242,7 +242,7 @@ int swConnection_sendfile(swConnection *conn, char *filename, off_t offset)
  {
  sw_strdup_free(task->filename);
  free(task);
  - swSysError("open(%s) failed.", task->filename);
  + swSysError("open(%s) failed.", filename);
  return SW_ERR;
  }
  task->fd = file_fd;
  