Bluetooth: hciuart: add missing NULL check in h5enqueue
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 v5.16.19 by commit e6b6c904c0f88588b6a3ace20e4c0d61eab124f8, it was introduced in version v5.15 by commit d9dd833cf6d29695682ec7e7924c0d0992b906bc. For more details please see the references link.