til_setup: add another helper for setup_func baking fails

This introduces til_setup_free_with_ret_err()
which just does the common idiom of:

- free the setup
- return with err code

so all these failure cases can be reduced to just a direct return
of calling this function.

Simpler version of til_setup_free_with_failed_setting_ret_err(),
which could have been reuesed for this by making the settings-related
parameters optional... but this way the call sites are less verbose
and these are tiny helpers it's harmless.

2 files changed, 12 insertions, 0 deletions

diff --git a/src/til_setup.c b/src/til_setup.c
index c06614f..d5231a1 100644
--- a/src/til_setup.c
+++ b/src/til_setup.c
@@ -124,3 +124,14 @@ int til_setup_free_with_failed_setting_ret_err(til_setup_t *setup, til_setting_t
 
 	return err;
 }
+
+
+/* another ergonomic helper for setup_funcs to use in res_setup baking */
+int til_setup_free_with_ret_err(til_setup_t *setup, int err)
+{
+	assert(err < 0);
+
+	til_setup_free(setup);
+
+	return err;
+}
diff --git a/src/til_setup.h b/src/til_setup.h
index eac1444..4491461 100644
--- a/src/til_setup.h
+++ b/src/til_setup.h
@@ -19,5 +19,6 @@ void * til_setup_new(const til_settings_t *settings, size_t size, void (*free_fu
 void * til_setup_ref(til_setup_t *setup);
 void * til_setup_free(til_setup_t *setup);
 int til_setup_free_with_failed_setting_ret_err(til_setup_t *setup, til_setting_t *failed_setting, til_setting_t **res_setting, int err);
+int til_setup_free_with_ret_err(til_setup_t *setup, int err);
 
 #endif