Fix out-of-bounds memory access#16
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There is a check
structure->model->lightmapID[i] >= 0before actually usinglightMap, but sincelightMapis already set tobsp->lightmapTextures[structure->model->lightmapID[i]]before that, there is an out-of-bounds memory access whenstructure->model->lightmapID[i]is less than 0. SincelightMapisn't used anywhere else, it can simply be moved after that check. This was found with-fsanitize=address.