nfc: nci: add flush_workqueue 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 v4.9.311 by commit 7d3232214ca4ea8f7d18df264c3b254aa8089d7f, it was introduced in version v3.2 by commit 6a2968aaf50c7a22fced77a5e24aa636281efca8. For more details please see the references link.