[backport v3.7-branch] bluetooth: host: hci_core: add missing `NULL` check#85299

nashif merged 2 commits intozephyrproject-rtos:v3.7-branchzephyrproject-rtos/zephyr:v3.7-branchfrom

Embeint:250206_37_conn_timeoutEmbeint/zephyr:250206_37_conn_timeoutCopy head branch name to clipboard