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 v4.9.318 by commit a8e03bcad52dc9afabf650fdbad84f739cec9efa, it was introduced in version v4.9.291 by commit ff169909eac9e00bf1aa0af739ba6ddfb1b1d135. For more details please see the references link.