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tree-wide: mark set-but-not-used variables as unused to make LLVM happy

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LLVM 13 introduced `-Wunused-but-set-variable` diagnostic flag, which
trips over some intentionally set-but-not-used variables or variables
attached to cleanup handlers with side effects (`_cleanup_umask_`,
`_cleanup_(notify_on_cleanup)`, `_cleanup_(restore_sigsetp)`, etc.):

```
../src/basic/process-util.c:1257:46: error: variable 'saved_ssp' set but not used [-Werror,-Wunused-but-set-variable]
        _cleanup_(restore_sigsetp) sigset_t *saved_ssp = NULL;
                                                     ^
                                                     1 error generated.
```
This commit is contained in:
Frantisek Sumsal
2021-09-15 13:09:45 +02:00
parent bd8ea741a4
commit d7ac09520b
33 changed files with 51 additions and 43 deletions
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src/udev/udevd.c
+2 -1
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@@ -1136,7 +1136,8 @@ static int on_ctrl_msg(UdevCtrl *uctrl, UdevCtrlMessageType type, const UdevCtrl
manager_reload(manager);
break;
case UDEV_CTRL_SET_ENV: {
_cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL, *old_val = NULL;
_unused_ _cleanup_free_ char *old_val = NULL;
_cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL;
const char *eq;
eq = strchr(value->buf, '=');