Fixed the off-by-one bug in SDL_RecursivelyCalculateShapeTree().
Fixed the off-by-one bug in SDL_RecursivelyCalculateShapeTree().

cebash/SDL_PSL1GHT,aduros/SDL,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,aduros/SDL,aduros/SDL,aduros/SDL,aduros/SDL,cebash/SDL_PSL1GHT