Kernel panic via stale regulator count

Improper input validation in Linux 6.0 and affected Siemens controllers allows local users to cause a kernel panic during PCIe setup. The brcmstb probe error path leaves the regulator count nonzero when regulator_bulk_get() creates no regulators, so a later link failure makes regulator_bulk_free() process nonexistent entries. Exploitation requires low-privileged local access and the Broadcom STB PCIe hardware path; the bounded result is a host or controller crash.