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/libsystemd/sd-bus/test-bus-chat.c

@@ -118,9 +118,7 @@ static int server_init(sd_bus **_bus) {
         return 0;
 
 fail:
-        if (bus)
-                sd_bus_unref(bus);
-
+        sd_bus_unref(bus);
         return r;
 }