ggml-quants : fix make_qp_quants NANs and IQ1 assertion errors (#15379) * ggml-quants : fix make_qp_quants NANs and IQ1 assertion errors * ggml-quants : avoid division by zero in make_q3_quants
ggml-quants : fix make_qp_quants NANs and IQ1 assertion errors (#15379) * ggml-quants : fix make_qp_quants NANs and IQ1 assertion errors * ggml-quants : avoid division by zero in make_q3_quants