PVS-Studio warning V583 for Cocos2d-x

spAtlas* spAtlas_readAtlas (....)
{
  ....
  page->uWrap = *str.begin == 'x' ? ATLAS_REPEAT :
    (*str.begin == 'y' ? ATLAS_CLAMPTOEDGE : ATLAS_REPEAT);
  page->vWrap = *str.begin == 'x' ? ATLAS_CLAMPTOEDGE :
    (*str.begin == 'y' ? ATLAS_REPEAT : ATLAS_REPEAT);     //<==
  ....
}

This suspicious code was found in Cocos2d-x project by PVS-Studio static code analyzer.
Warning message is:
V583 The '?:' operator, regardless of its conditional expression, always returns one and the same value: ATLAS_REPEAT. atlas.cpp 219

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