Local denial of service via PHY reference leak

Resource leakage in Linux kernel PHY LED handling allows local users to interrupt service through resource exhaustion. In drivers/net/phy/phy_device.c, a successful of_get_child_by_name() call increments the leds node reference count, but the probe path omits of_node_put() and retains the reference. Reachability requires low-privileged local access and a PHY device-tree configuration containing an leds child node; the reported consequence is availability loss.