PVS-Studio warning V523 for MAME

static DEVICE_START( deco16ic )
{
  ...
  if (intf->split)
    deco16ic->pf2_tilemap_16x16 =
      tilemap_create_device(device, get_pf2_tile_info,
        deco16_scan_rows, 16, 16, fullwidth ?
          64 : 32, fullheight ? 64 : 32);
  else
    deco16ic->pf2_tilemap_16x16 =
      tilemap_create_device(device, get_pf2_tile_info,
        deco16_scan_rows, 16, 16, fullwidth ?
          64 : 32, fullheight ? 64 : 32);
  ...
}

This suspicious code was found in MAME project by PVS-Studio static code analyzer.
Warning message is:
V523 The 'then' statement is equivalent to the 'else' statement.  deco16ic.c 943

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/