fix leak

[todo]

RT/src/json/list.c

Lines 71 to 76 in 0f076bf

	// TODO fix leak
	if (*walker != ']')
	return (NULL);
	*str = &walker[1];
	return (mk_list(list));
	}

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This issue was generated by todo based on a TODO comment in 0f076bf when #17 was merged. cc @emiflake.