common : fix compile warning

examples/common-ggml.cpp

@@ -217,6 +217,7 @@ bool ggml_common_quantize_0(
                 case GGML_TYPE_Q4_0_8_8:
                 case GGML_TYPE_TQ1_0:
                 case GGML_TYPE_TQ2_0:
+                case GGML_TYPE_IQ4_NL_4_4:
                 case GGML_TYPE_COUNT:
                     {
                         fprintf(stderr, "%s: unsupported quantization type %d (%s)\n", __func__, ttype, ggml_type_name((ggml_type) ttype));