PVS-Studio warning V555 for OpenJPEG

typedef struct opj_stepsize
{
  OPJ_UINT32 expn;
  OPJ_UINT32 mant;
};

bool j2k_read_SQcd_SQcc(
  opj_j2k_t *p_j2k,
  OPJ_UINT32 p_comp_no,
  OPJ_BYTE* p_header_data,
  OPJ_UINT32 * p_header_size,
  struct opj_event_mgr * p_manager
  )
{
  ....
  OPJ_UINT32 l_band_no;
  ....
  l_tccp->stepsizes[l_band_no].expn =
    ((l_tccp->stepsizes[0].expn) - ((l_band_no - 1) / 3) > 0) ?
      (l_tccp->stepsizes[0].expn) - ((l_band_no - 1) / 3) : 0;
  ....
}

This suspicious code was found in OpenJPEG project by PVS-Studio static code analyzer.
Warning message is:
V555 The expression of the 'A - B > 0' kind will work as 'A != B'. itkopenjpeg j2k.c 3421

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/