[PATCH 4.14/4.19/5.4/5.10/5.15 0/1] Bluetooth: hci_sock: purge socket queues in the destruct() callback

[Fedor Pchelkin]

Syzkaller reports a memory leak in mgmt_cmd_complete(). The issue can be
triggered on 4.14/4.19/5.4/5.10/5.15 stable branches. The following fixing
patch can be cleanly applied to them.