udev: use safe_close() where we can

src/udev/udev-ctrl.c

@@ -197,8 +197,7 @@ struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) {
         udev_ctrl_ref(uctrl);
         return conn;
 err:
-        if (conn->sock >= 0)
-                close(conn->sock);
+        safe_close(conn->sock);
         return mfree(conn);
 }