udevd: worker - allow passing NULL to worker_unref()

diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 0458af1309083c7a53440587b5a776df437091ad..661047ea264c93dac8479a5f644b1f4a6e63c040 100644 (file)
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -150,8 +150,7 @@ static void worker_cleanup(struct worker *worker) {
 }
 
 static void worker_unref(struct worker *worker) {
-        worker->refcount--;
-        if (worker->refcount > 0)
+        if (!worker || (-- worker->refcount) > 0)
                 return;
         log_debug("worker ["PID_FMT"] cleaned up", worker->pid);
         worker_cleanup(worker);