CVE-2025-23136 thermal: int340x: Add NULL check for adev

In the Linux kernel, the following vulnerability has been resolved: thermal: int340x: Add NULL check for adev Not all devices have an ACPI companion fwnode, so adev might be NULL. This is similar to the commit cd2fd6eab480 "platform/x86: int3472: Check for adev == NULL". Add a check for adev not...