PVS-Studio warning V568 for CxImage

static jpc_enc_tcmpt_t *tcmpt_create(....)
{
  ...
  memset(tcmpt->stepsizes, 0,
    sizeof(tcmpt->numstepsizes * sizeof(uint_fast16_t)));
  ...
}

This is what should have been written here: memset(tcmpt->stepsizes, 0, tcmpt->numstepsizes * sizeof(uint_fast16_t));

This suspicious code was found in CxImage project by PVS-Studio static code analyzer.
Warning message is:
V568 It's odd that the argument of sizeof() operator is the expression. jasper jpc_enc.c 2157

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/