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template: fix possible use-after-free and drop the `render' sugar if some of the tp_* function fails, the inner code could free the template too (that's what galileo does), so `tp->tp_ret' would access free'd memory! Instead, add a local variable `tp_ret' to keep track of the return code. While here, drop the `render' shortand that adds the argument call, the template_reset function and adapt the regress.
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1 {! #include <stdlib.h> !}

3 {{ define base(struct template *tp, const char *title) }}

4 <!doctype html>

5 <html>

6 	<head>

7 		<title>{{ title | urlescape }}</title>

8 	</head>

9 	<body>

10 		<h1>{{ title | unsafe }}</h1>

11 	</body>

12 </html>

13 {{ end }}