NFC: NULL out the dev->rfkill to prevent UAF
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 v4.14.283 by commit f81270125b50532624400063281e6611ecd61ddf, it was introduced in version v4.14.256 by commit 47244ac0b65bd74cc70007d8e1bac68bd2baad19. For more details please see the references link.