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 v4.19.247 by commit 6abfaca8711803d0d7cc8c0fac1070a88509d463, it was introduced in version v4.19.218 by commit c45cea83e13699bdfd47842e04d09dd43af4c371. For more details please see the references link.