watchdog: Fix possible use-after-free in wdt_startup()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.9.276 by commit 862f2b5a7c38762ac9e369daefbf361a91aca685. For more details please see the references link.