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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 bff58270 2022-09-19 op {! #include <stdlib.h> !}

 2 bff58270 2022-09-19 op 

 3 bff58270 2022-09-19 op {{ define base(struct template *tp, const char *title) }}

 4 bff58270 2022-09-19 op {! char *foo = NULL; !}

 5 bff58270 2022-09-19 op <!doctype html>

 6 bff58270 2022-09-19 op <html>

 7 bff58270 2022-09-19 op 	<head>

 8 bff58270 2022-09-19 op 		<title>{{ title }}</title>

 9 bff58270 2022-09-19 op 	</head>

10 bff58270 2022-09-19 op 	<body>

11 bff58270 2022-09-19 op 		<h1>{{ title }}</h1>

12 bff58270 2022-09-19 op 	</body>

13 bff58270 2022-09-19 op </html>

14 bff58270 2022-09-19 op {{ finally }}

15 bff58270 2022-09-19 op {! free(foo); !}

16 bff58270 2022-09-19 op {{ end }}