MDEV-16365 Setting a column NOT NULL fails to return error for

	NULL values when there is no DEFAULT

- Fixed typecasting failure for log->n_rows in row0log.cc

storage/innobase/row/row0log.cc

@@ -1624,7 +1624,7 @@ row_log_table_apply_convert_mrec(
 			Field* field = log->old_table->field[col_no];
 
 			field->set_warning(Sql_condition::WARN_LEVEL_WARN,
-					   WARN_DATA_TRUNCATED, 1, log->n_rows);
+					   WARN_DATA_TRUNCATED, 1, ulong(log->n_rows));
 
 			if (!log->allow_not_null) {
 				/* We got a NULL value for a NOT NULL column. */