PVS-Studio warning V519 for OpenCV

void jpc_init_t2state(jpc_enc_t *enc, int raflag)
{
  ....
  for (pass = cblk->passes; pass != endpasses; ++pass) {
    pass->lyrno = -1;
    pass->lyrno = 0;
  }
  ....
}

This suspicious code was found in OpenCV project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'pass->lyrno' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 539, 540. jpc_t2enc.c 540

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/