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/resolve/resolved-manager.c

@@ -176,8 +176,7 @@ static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, voi
                 break;
 
         case RTM_DELADDR:
-                if (a)
-                        link_address_free(a);
+                link_address_free(a);
                 break;
         }