If error occurs in `compile_data()`, data context is not deleted

[wch]

Looking at the code here:

sass/src/compile.c

Lines 113 to 140 in d9fe971

	SEXP compile_data(SEXP data, SEXP options) {
	const char* data_string = CHAR(asChar(data));
	// sass_delete_data_context will free input
	char* input = sass_copy_c_string(data_string);
	// freed by sass_delete_data_context
	struct Sass_Data_Context* data_context = sass_make_data_context(input);
	// Both context and options return the same data_context
	// pointer which is freed by sass_delete_data_context
	// https://github.com/sass/libsass/blob/ea0e39767600e879a2774509569a432b56cf4750/src/sass_context.cpp#L647
	struct Sass_Context* context = sass_data_context_get_context(data_context);
	struct Sass_Options* sass_options = sass_context_get_options(context);
	set_options(sass_options, options);
	int status = sass_compile_data_context(data_context);
	if (status != 0)
	error("%s", sass_context_get_error_message(context));
	SEXP ret = PROTECT(mkString(sass_context_get_output_string(context)));
	sass_delete_data_context(data_context);
	UNPROTECT(1);
	return ret;
	}

It says:

Both context and options return the same data_context pointer which is freed by sass_delete_data_context

However, in the error code path, sass_delete_data_context() never gets called.

[wch]

This might be related to r-wasm/webr#525.