daemon: plug memory leak

Detected by Coverity.  Commit ef21beda was incomplete; it solved
a leak one one path, but not on the other.

* daemon/libvirtd.c (qemudSetLogging): Avoid leak on success.

daemon/libvirtd.c

@@ -2783,6 +2783,7 @@ qemudSetLogging(struct qemud_server *server, virConfPtr conf,
                     VIR_FREE(userdir);
                     goto out_of_memory;
                 }
+                VIR_FREE(userdir);
             }
         } else {
             if (virAsprintf(&tmp, "%d:stderr", virLogGetDefaultPriority()) < 0)