Bug #944: Deletion of unnecessary checks before a few calls of systemd functions

The following functions return immediately if a null pointer was passed.
* calendar_spec_free
* link_address_free
* manager_free
* sd_bus_unref
* sd_journal_close
* udev_monitor_unref
* udev_unref

It is therefore not needed that a function caller repeats a corresponding check.

This issue was fixed by using the software Coccinelle 1.0.1.

src/machine/machined.c

@@ -355,8 +355,7 @@ int main(int argc, char *argv[]) {
         log_debug("systemd-machined stopped as pid "PID_FMT, getpid());
 
 finish:
-        if (m)
-                manager_free(m);
+        manager_free(m);
 
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }