PVS-Studio warning V512 for MAME

UINT16      m_rotate_ctrl[8];

static MACHINE_RESET( wgp )
{
  wgp_state *state = machine.driver_data<wgp_state>();
  int i;

  state->m_banknum = 0;
  state->m_cpua_ctrl = 0xff;
  state->m_port_sel = 0;
  state->m_piv_ctrl_reg = 0;

  for (i = 0; i < 3; i++)
  {
    state->m_piv_zoom[i] = 0;
    state->m_piv_scrollx[i] = 0;
    state->m_piv_scrolly[i] = 0;
  }

  memset(state->m_rotate_ctrl, 0, 8);
}

This suspicious code was found in MAME project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer 'state->m_rotate_ctrl'.  wgp.c 949

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/