[backport v4.0-branch] bluetooth: host: hci_core: add missing `NULL` check#85723

dkalowsk merged 2 commits intozephyrproject-rtos:v4.0-branchzephyrproject-rtos/zephyr:v4.0-branchfrom

Embeint:250213_40_conn_timeoutEmbeint/zephyr:250213_40_conn_timeoutCopy head branch name to clipboard