Otherwise, it will keep consuming memory on systemctl daemon-reload.
(cherry picked from commit
3deed59afdc2c18ecb76fe90b9bba0cd66045dfa)
Gbp-Pq: Name Always-free-deserialized_subscribed-on-reload.patch
/* Clean up runtime objects no longer referenced */
manager_vacuum(m);
+ /* Clean up deserialized tracked clients */
+ m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
+
/* Consider the reload process complete now. */
assert(m->n_reloading > 0);
m->n_reloading--;