     if (!pixa0)         return (PIXA *)ERROR_PTR("pixa0 not defined", procName, NULL);     if (!pixa0)         return (PIXA *)ERROR_PTR("pixa0 not defined", procName, NULL);     if (copyflag != L_COPY && copyflag != L_CLONE)         return (PIXA *)ERROR_PTR("invalid copyflag", procName, NULL);     